Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh ha » thanh hoa, thanh hai, nhanh ha
hieu van » hieu va, thien van, lieu va
thu sac » thu sach, thu san, thu xac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cac le » cach le, cac he, mac le
le ban » le bang, te ban, lo ban
ha cua » hoa cua, hai cua, nha cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ((ky lang) OR (ky dang)) xa hoi. ((hieu ve) or (hieu van)) cac le ban thanh ha cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ((ky lang) OR (ky dang)) xa hoi. ((hieu ve) OR (hieu van)) cac le ban thanh ha cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ((ky lang) OR (ky dang)) xa hoi. ((hieu ve) or (hieu van)) cac le ban thanh ha cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sac ((ky lang) OR (ky dang)) xa hoi. ((hieu ve) or (hieu van)) cac le ban thanh ha cua tre*.