Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
danh vai » danh sai, danh va, doanh van
mai khoi » mai khoa, tai khoa, cac khoi
ky tang » ky nang, ky dang, kho tang
mai hoi » dai hoi, lai hoi, mai doi
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
ky sang » ky nang, ky dang, duy sang
vai dau » va dau, van dau, xvii dau
tu sach » thu sach, su sach, te sach
ve cam » ve cham, ve cac, va cam
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: tu sach ((ky sang) or (ky tang)) ((mai hoi) or (mai khoi)). hieu ve cam xuc va danh vai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky tang)) ((mai hoi) OR (mai khoi)). hieu ve cam xuc va danh vai dau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) or (ky tang)) ((mai hoi) or (mai khoi)). hieu ve cam xuc va danh vai dau tren*.