Perhaps you should try some spelling variations:
thanh hang » thanh hoang, thanh thang, tranh hang
thanh han » thanh phan, thanh nhan, thanh san
thu sac » thu sach, thu san, thu xac
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

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 nang xa hoi. ((hieu va) or (hieu qua)) cac lo va ((thanh han) OR (thanh hang)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang xa hoi. ((hieu va) OR (hieu qua)) cac lo va ((thanh han) OR (thanh hang)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang xa hoi. ((hieu va) or (hieu qua)) cac lo va ((thanh han) OR (thanh hang)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang xa hoi. ((hieu va) or (hieu qua)) cac lo va ((thanh han) OR (thanh hang)) cua tre*.