Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
ky lang » ky dang, ky tang, tay lang
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
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 sach ((ky lang) or (ky nang)) dai hoi. hieu ve cac xuc va danh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky nang)) dai hoi. hieu ve cac xuc va danh vi ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) or (ky nang)) dai hoi. hieu ve cac xuc va danh vi ((dua tren) or (cuu tre))*.