Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
thu sai » thu hai, thu tai, thu san
nam dua » nam da, nam cua, nam mua
dua ban » dia ban, cua ban, qua ban
cua tre » cuu tre, cua triet, dua tren
sai ky » sac ky
ma hoi » mai hoi, xa hoi, me hoi
cua te » cua tu

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 dua ban thanh vai ((cua tre) OR (cua te))~.
• 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 dua ban thanh vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sai ky nang ((ma hoi) or (ma hoa)). hieu van nam dua ban thanh vai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu sai ky nang ((ma hoi) or (ma hoa)). hieu van nam dua ban thanh vai ((cua tre) OR (cua te))*.