Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
dua tren » dung tren
sang dai » sang tai, lang dai, sang mai
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va
dai hoi » dai hoc, dai hai, dai moi
cao luc » bao luc, cao duc, cao suc
luc va » duc va, tuc va, loc 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. ((hieu ve) OR (hieu van)) cao luc 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. ((hieu ve) OR (hieu van)) cao luc 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. ((hieu ve) OR (hieu van)) cao luc va thanh vai ((cuu tre) or (dua tren))*".