Perhaps you should try some spelling variations:
ve triet » va trien, su triet
vuc nang » cuc nang, vu nang, chuc nang
van hanh » van thanh, ban hanh, van anh
sach vuc » sach duoc, sach nuoc, sach truc
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, me hoi
kem ve » ke ve
va cam » va cham, va cac, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach vuc nang ((ma hoi) or (ma hoa)). hieu ((va cam) or (va cao)) duc van hanh kem ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vuc nang ((ma hoi) OR (ma hoa)). hieu ((va cam) OR (va cao)) duc van hanh kem ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach vuc nang ((ma hoi) or (ma hoa)). hieu ((va cam) or (va cao)) duc van hanh kem ve triet*.