Perhaps you should try some spelling variations:
thanh cac » hanh cac, thanh bac, tranh cac
thanh ca » thanh cha, thanh ha, thanh va
cua tre » cua te, cuu tre, cua triet
cau luc » cau truc, cau phuc
van hoi » van hoc, van hoe, van loi
hieu ve » hieu va, hieu van
luc va » duc va, tuc va, loc va
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, ve cac
va sac » va cac, va suc, va san

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

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