Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
ban hanh » ban hang
va thanh » gia thanh, ban thanh, va tinh
tu nang » tru nang, tu nong, tu lang
tu nano » truc nano
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
so anh » so sanh, so danh, do anh
ve cac » va cac, vien cac
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so anh ((tu nang) OR (tu nano)) xa hoi. hieu ve cac xuc ((ban hanh) or (va thanh)) vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so anh ((tu nang) OR (tu nano)) xa hoi. hieu ve cac xuc ((ban hanh) OR (va thanh)) vi va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so anh ((tu nang) OR (tu nano)) xa hoi. hieu ve cac xuc ((ban hanh) or (va thanh)) vi va trien".
• Adding a wildcard symbol may retrieve word variants: so anh ((tu nang) OR (tu nano)) xa hoi. hieu ve cac xuc ((ban hanh) or (va thanh)) vi va trien*.