Perhaps you should try some spelling variations:
thien van » thi van
va triet » va thiet, va trien, ve triet
hanh dam » thanh dam, hanh lam, hanh nam
van hanh » van thanh, ban hanh, van anh
tru nang » tra nang, tri nang, truc nano
hieu van » hieu va, lieu va, hieu ve
chao su » cao su, chao xu, achat su
su sach » so sach, vu sach
tu nang » tu nong, tu nano, tu lang
su van » tu van, vu van
dam va » dam van, nam va, dam ha

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 ((tu nang) or (tru nang)) xa hoi. ((hieu van) or (thien van)) chao su van hanh dam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu nang) OR (tru nang)) xa hoi. ((hieu van) OR (thien van)) chao su van hanh dam va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((tu nang) or (tru nang)) xa hoi. ((hieu van) or (thien van)) chao su van hanh dam va triet*.