Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, lieu va
thu sai » thu hai, thu tai, thu san
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
sai ky » sac ky
ma hoi » mai hoi, xa hoi, me hoi
nam di » nam doi, nam da, nam do
di ban » dia ban, doi ban, di san

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sai ky nang ((ma hoi) or (ma hoa)). hieu van nam di ban thanh van ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky nang ((ma hoi) OR (ma hoa)). hieu van nam di ban thanh van ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: thu sai ky nang ((ma hoi) or (ma hoa)). hieu van nam di ban thanh van ((cuu tre) or (cua tre))*.