Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cac khoi » cac thoi, cac khoan, cach thoi
cau treo » cau theo, cau tren, cau triet
danh sai » dung sai, danh bat, danh dau
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
nam xuc » cam xuc, nam xua, nam thuc
va danh » va dinh, va dan, va hanh
ky tang » ky nang, ky dang, kho tang
thu sac » thu sach, thu san, thu xac
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc 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 tang ((mai hoi) or (cac khoi)). hieu van nam xuc va danh sai ((cau treo) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky tang ((mai hoi) OR (cac khoi)). hieu van nam xuc va danh sai ((cau treo) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: thu sac ky tang ((mai hoi) or (cac khoi)). hieu van nam xuc va danh sai ((cau treo) or (dau tren))*.