Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
hieu van » thien van, lieu va
tham soc » cham soc, tham nuoc, thai son
va hanh » van hanh, va thanh, va danh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va dung » van dung, va duong, vat dung
hanh va » hang va, hanh vi
hieu va » lieu va, hieu qua
te san » te ban, ke san, tu san
soc va » hoc va, loc va, doc va
san ky » sang ky, van ky, dan ky

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 lang xa hoi. ((((hieu van) OR (hieu ve))) or (hieu va)) tham soc va hanh va dung tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky lang xa hoi. ((((hieu van) OR (hieu ve))) OR (hieu va)) tham soc va hanh va dung tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky lang xa hoi. ((((hieu van) OR (hieu ve))) or (hieu va)) tham soc va hanh va dung tren".
• Adding a wildcard symbol may retrieve word variants: te san ky lang xa hoi. ((((hieu van) OR (hieu ve))) or (hieu va)) tham soc va hanh va dung tren*.