Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh hai » thanh hai, nhanh hai, hang hai
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
su dai » sau dai, su tai, su hai
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su dai) or (si dai)) ky nang xa hoi. hieu van cac tuc va ((hanh hai) or (dung tai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su dai) OR (si dai)) ky nang xa hoi. hieu van cac tuc va ((hanh hai) OR (dung tai)) cua tu.
• Adding a wildcard symbol may retrieve word variants: ((su dai) or (si dai)) ky nang xa hoi. hieu van cac tuc va ((hanh hai) or (dung tai)) cua tu*.