Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh va » hanh va, thanh ha, thanh ve
so sang » so sanh, so dang, so lang
cao suc » cao su, cao duc
chua te » cua te, chua tu, chua xe
sang ky » sang kyo, dang ky, tang ky
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
co suc » co su, cong suc

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sang ky nang xa hoi. hieu va ((co suc) or (cao suc)) gia ((thanh va) OR (thanh van)) chua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sang ky nang xa hoi. hieu va ((co suc) OR (cao suc)) gia ((thanh va) OR (thanh van)) chua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sang ky nang xa hoi. hieu va ((co suc) or (cao suc)) gia ((thanh va) OR (thanh van)) chua te".
• Adding a wildcard symbol may retrieve word variants: so sang ky nang xa hoi. hieu va ((co suc) or (cao suc)) gia ((thanh va) OR (thanh van)) chua te*.