Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va cham » va chat
va tham » van tham, va thanh, va thuat
va hanh » van hanh, va thanh, va danh
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, 5 hoi

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 nang ((x hoi) or (x ho)). hieu ((va cham) OR (va tham)) luc va hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (x ho)). hieu ((va cham) OR (va tham)) luc va hanh tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) or (x ho)). hieu ((va cham) OR (va tham)) luc va hanh tai cuu tre*".