Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
dua tren » dung tren
va thanh » gia thanh, ban thanh, va tinh
cuu tre » cua tre, cau tren, cau treo
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
dai moi » doi moi
dai hoi » dai hoc, dai hai
cao suc » cao su, cao duc
ve cao » va cao, ve bao, ve cac
suc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky sang ((dai hoi) OR (dai moi)). hieu ve cao suc va thanh vai ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky sang ((dai hoi) OR (dai moi)). hieu ve cao suc va thanh vai ((cuu tre) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky sang ((dai hoi) OR (dai moi)). hieu ve cao suc va thanh vai ((cuu tre) or (dua tren))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky sang ((dai hoi) OR (dai moi)). hieu ve cao suc va thanh vai ((cuu tre) or (dua tren))*.