Perhaps you should try some spelling variations:
thanh cac » hanh cac, thanh bac, tranh cac
nang van » dang van, tang van, lang van
thanh ca » thanh cha, thanh ha, thanh va
cua tre » cua te, cuu tre, cua triet
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang van hoi. hieu ve ((cac tuc) OR (cac tac)) va ((thanh ca) or (thanh cac)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang van hoi. hieu ve ((cac tuc) OR (cac tac)) va ((thanh ca) OR (thanh cac)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang van hoi. hieu ve ((cac tuc) OR (cac tac)) va ((thanh ca) or (thanh cac)) cua tre*".