Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang dau » hang va, hang tai
te sach » toc sach
dau hoi » cau hoi, dai hoi, dan hoi
qua cam » qua cham, qua cac, qua ca
danh vi » hanh vi, dinh vi, danh va
danh di » danh du, xanh di, danh dien
y hang » ly hang, ty hang, yu hang
xac va » tac va, ac va, bac 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 y hang dau hoi. hieu qua cam ((xac va) or (duc va)) ((danh vi) OR (danh di)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y hang dau hoi. hieu qua cam ((xac va) OR (duc va)) ((danh vi) OR (danh di)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y hang dau hoi. hieu qua cam ((xac va) or (duc va)) ((danh vi) OR (danh di)) cua triet*".