Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
cua triet » cua viet, su triet, va triet
nam thuc » am thuc, nam thu, nam tu
nang hoc » nang doc, nang luc, dong hoc
hanh hai » thanh hai, nhanh hai, hang hai
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu he » hieu ve, hiem he, hieu hien
hoc hoi » hoc khoi, hoc hoa, hoc noi
ty nang » ky nang, ty xang, ty hang
hieu le » hieu ve, hieu ly, tieu le

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang hoc hoi. ((hieu he) OR (hieu le)) ((nam thuc) or (nam thuoc)) va hanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang hoc hoi. ((hieu he) OR (hieu le)) ((nam thuc) OR (nam thuoc)) va hanh hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang hoc hoi. ((hieu he) OR (hieu le)) ((nam thuc) or (nam thuoc)) va hanh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang hoc hoi. ((hieu he) OR (hieu le)) ((nam thuc) or (nam thuoc)) va hanh hai cua triet*.