Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
nang dau » hang dau, xang dau, nang du
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
sach ty » sach tu, sach thu, xach tay
dau hoi » cau hoi, dai hoi, dan hoi
hieu va » lieu va, hieu qua
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: su ((sach ty) or (sach y)) nang dau hoi. hieu va cac tuc va hanh vai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang dau hoi. hieu va cac tuc va hanh vai ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang dau hoi. hieu va cac tuc va hanh vai ((cua triet) or (cua viet))*.