Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
cao thuc » cao thuoc, bao thuc, can thuc
hoc sach » hoc sinh, hoc cac, hoc anh
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao

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) or (hoc sach)) y nang ma hoi. lieu va cao thuc va hanh lai ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) y nang ma hoi. lieu va cao thuc va hanh lai ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (hoc sach)) y nang ma hoi. lieu va cao thuc va hanh lai ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) y nang ma hoi. lieu va cao thuc va hanh lai ((cua triet) OR (su triet))*.