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

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((ma hoi) or (ma hoa)). hieu van nam dua ban thanh vai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (ma hoa)). hieu van nam dua ban thanh vai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) or (ma hoa)). hieu van nam dua ban thanh vai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (ma hoa)). hieu van nam dua ban thanh vai ((cuu tre) OR (cau treo))*.