Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
nang dau » hang dau, xang dau, nang du
sach ty » sach tu, sach thu, xach tay
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
qua cam » qua cham, qua cac, qua ca
dau hoi » cau hoi, dai hoi, dan hoi
tuc va » truc va, tuc xa, duc va

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