Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
sach thu » sach thue, sach thieu, sach tham
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
sach ty » sach y, sach tu, xach tay
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ty) or (sach thu)) nang ma hoi. hieu ve cac tuc va hanh vi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach thu)) nang ma hoi. hieu ve cac tuc va hanh vi ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sach thu)) nang ma hoi. hieu ve cac tuc va hanh vi ((cua triet) or (cua viet))*.