Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
ban thanh » ban hanh, ban hang
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
tuc ban » thuc ban, truc ban, tu ban
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, mang may
cac tuc » cac toc, cac tu, cac tac
sach v » sach va, sach y, sach 2

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 v ((nang ma) or (nang cao)) hoi. hieu va cac tuc ban thanh vi ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang ma) OR (nang cao)) hoi. hieu va cac tuc ban thanh vi ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang ma) or (nang cao)) hoi. hieu va cac tuc ban thanh vi ((cua triet) or (va triet))*.