Perhaps you should try some spelling variations:
dat duoc » dat nuoc, da duoc, luat duoc
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, ban hanh
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, dia danh
di cua » dai cua, doi cua, de cua
vu san » va san, vu ban
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: vu san ky tang xa hoi. ((hieu ve) OR (hieu va)) dat duoc ((va hanh) or (va danh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky tang xa hoi. ((hieu ve) OR (hieu va)) dat duoc ((va hanh) OR (va danh)) di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky tang xa hoi. ((hieu ve) OR (hieu va)) dat duoc ((va hanh) or (va danh)) di cua tre*".