Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang mai » nang ma, nang tai, lang mai
cua tre » cua te, cuu tre, dua tren
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
soc va » hoc va, loc va, doc va

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