Perhaps you should try some spelling variations:
thanh vai » thanh van, thanh tai, thanh oai
thanh hai » thanh phan, thanh hoa, thanh san
dang dai » dang hai, dang bai, dang dan
dua tren » dung tren
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
cuu tre » cua tre, cau tren, cau treo
ky dang » ky nang, ky danh
ve cao » va cao, ve bao, ve cac
su va » su van, tu 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 dang dai hoi. hieu ve cao su va ((thanh vai) or (thanh hai)) ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky dang dai hoi. hieu ve cao su va ((thanh vai) OR (thanh hai)) ((cuu tre) OR (dua tren)).
• Adding a wildcard symbol may retrieve word variants: tu cac ky dang dai hoi. hieu ve cao su va ((thanh vai) or (thanh hai)) ((cuu tre) or (dua tren))*.