Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
van thanh » ban thanh, van tuan
thu sac » thu sach, thu san, thu xac
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
cam lo » nam lo, cam ly, cam o
lo van » le van, vo van, so van

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 ((cao hoi) or (co hoc)). hieu va cam lo van thanh hai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ((cao hoi) OR (co hoc)). hieu va cam lo van thanh hai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ((cao hoi) or (co hoc)). hieu va cam lo van thanh hai ((cua tre) or (cuu tre))*.