Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
danh vai » danh sai, danh va, doanh van
lang dai » lang hai, lang mai, lang chai
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
ve cham » va cham, ve chat, vu cham
dai hoi » dai hoc, dai hai, dai moi
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (su sach)) ky lang dai hoi. hieu ((ve cham) or (va cao)) luc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (su sach)) ky lang dai hoi. hieu ((ve cham) OR (va cao)) luc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (su sach)) ky lang dai hoi. hieu ((ve cham) or (va cao)) luc va danh vai cua tre*.