Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
tai cuu » tai cuc, tai buu, tai cua
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
hai hoi » hai moi, hai hai, hai hoa
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang ((hai hoi) or (dai hoi)). hieu ((ve cam) or (va cam)) duc va hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang ((hai hoi) OR (dai hoi)). hieu ((ve cam) OR (va cam)) duc va hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang ((hai hoi) or (dai hoi)). hieu ((ve cam) or (va cam)) duc va hanh tai cuu tre*.