Perhaps you should try some spelling variations:
thanh cac » thanh bac, thanh ca, tranh cac
hanh cac » hang cac, hanh cat, nhanh cay
cua tre » cua te, cuu tre, cua triet
ky lang » ky nang, ky dang, ky tang
van hoi » van hoa, van hoc, van loi
van hoe » van hoa, van hoc, van hieu
hieu ve » hieu va, hieu van
cac loc » cac lop, cac toc, cac hoc
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
loc va » hoc va, luc va
ve cac » va cac, vien cac

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 lang ((van hoi) or (van hoe)). hieu ve cac loc va ((thanh cac) OR (hanh cac)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky lang ((van hoi) OR (van hoe)). hieu ve cac loc va ((thanh cac) OR (hanh cac)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky lang ((van hoi) or (van hoe)). hieu ve cac loc va ((thanh cac) OR (hanh cac)) cua tre*".