Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
mai khoi » mai khoa, tai khoa, cac khoi
danh sai » dung sai, danh bat, danh dau
hieu van » hieu va, thien van, lieu va
sai cau » lai chau, mai chau, hai chau
va danh » va dinh, va dan, va hanh
nam xuc » cam xuc, nam xua, nam thuc
thu sac » thu sach, thu san, thu dac
mai hoi » dai hoi, lai hoi, mai doi
ky tang » ky nang, ky dang, kho tang
thu xac » thau xay
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) OR (thu xac)) 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 sac) OR (thu xac)) ky tang ((mai hoi) OR (mai khoi)). hieu van nam xuc va danh sai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sac) OR (thu xac)) 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 sac) OR (thu xac)) ky tang ((mai hoi) or (mai khoi)). hieu van nam xuc va danh sai cau tren*.