Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
hieu van » hieu va, thien van, lieu va
danh sai » dung sai, danh bat, danh dau
cau tren » cu tren, dau tren, ca tren
thu sai » thu hai, thu tai, thu san
ky tang » ky nang, ky dang, kho tang
mai hoi » dai hoi, lai hoi, mai doi
nam xuc » cam xuc, nam xua, nam thuc
va danh » va dinh, va dan, va hanh
sai cau » lai chau, mai chau, hai chau
sai ky » sac 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 sai ky tang ((mai hoi) or (mai khoi)). hieu van nam xuc va danh sai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky tang ((mai hoi) OR (mai khoi)). hieu van nam xuc va danh sai cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sai ky tang ((mai hoi) or (mai khoi)). hieu van nam xuc va danh sai cau tren*.