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

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. hieu ve cao suc ((va thanh) OR (ban 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. hieu ve cao suc ((va thanh) OR (ban 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. hieu ve cao suc ((va thanh) OR (ban thanh)) vai ((cuu tre) or (dua tren))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky sang dai hoi. hieu ve cao suc ((va thanh) OR (ban thanh)) vai ((cuu tre) or (dua tren))*.