Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh ho » thanh pho, thanh hoa, thanh hoc
cua tre » cua te, cuu tre, cua triet
cac luc » cau luc, cac nuoc, cac cuoc
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
ho cua » hoc cua, hoi cua, hoa cua
vu sac » vu sach, vu san, va sac

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