Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dai truc » dai thuc, doan truc, dai trung
hanh lam » thanh lap, hanh kem, hanh va
dau truc » cau truc, doan truc, dau tu
cua tre » cua te, cuu tre, dua tren
va hanh » van hanh, va thanh, va danh
te sach » toc sach
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa

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 y tang ma hoi. hieu va ((dau truc) OR (dai truc)) va hanh lam ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y tang ma hoi. hieu va ((dau truc) OR (dai truc)) va hanh lam ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y tang ma hoi. hieu va ((dau truc) OR (dai truc)) va hanh lam ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach y tang ma hoi. hieu va ((dau truc) OR (dai truc)) va hanh lam ((cua tre) or (cua triet))*.