Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
danh sai » dung sai, danh bat, danh dau
mai khoi » mai khoa, tai khoa, dai khoa
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
cac khoi » cac thoi, cac khoan, cach thoi
sai cau » lai chau, mai chau, hai chau
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
thu sac » thu sach, thu san, thu xac
dai hoi » dai hoc, dai hai, dai moi
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky

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 ((dai hoi) or (((mai khoi) or (cac khoi)))). hieu van nam thuc va danh sai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky tang ((dai hoi) OR (((mai khoi) OR (cac khoi)))). hieu van nam thuc va danh sai cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sac ky tang ((dai hoi) or (((mai khoi) or (cac khoi)))). hieu van nam thuc va danh sai cau tren*.