Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
van cau » van dau, van hau, van chat
dinh ve » dinh ket, dinh van
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
xuc va » duc va, tuc va, luc va
ve va » ve van, te va, ke 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 san ky tang xa hoi. hieu van cau ((xuc va) or (((thuc va) OR (thuc day)))) dinh ve va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky tang xa hoi. hieu van cau ((xuc va) OR (((thuc va) OR (thuc day)))) dinh ve va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky tang xa hoi. hieu van cau ((xuc va) or (((thuc va) OR (thuc day)))) dinh ve va trien".
• Adding a wildcard symbol may retrieve word variants: te san ky tang xa hoi. hieu van cau ((xuc va) or (((thuc va) OR (thuc day)))) dinh ve va trien*.