Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh vi » thanh va, thanh ve, nhanh vi
lang xa » lang ha, dang xay, lang van
van hai » van ha, van chat, van hanh
hai hoc » thai hoc, hai huoc, dai hoc
cuu tre » cua tre, cau tren, cau treo
can ky » dan ky, ban ky, tan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((can ky) or (van ky)) lang xa hoi. hieu van hai hoc va ((thanh vi) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((can ky) OR (van ky)) lang xa hoi. hieu van hai hoc va ((thanh vi) OR (hanh vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) or (van ky)) lang xa hoi. hieu van hai hoc va ((thanh vi) or (hanh vi)) cuu tre*.