Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu te » hieu ve, hien te, hieu he
va hanh » van hanh, va danh, ban hanh
cu tren » tu tren, dua tren
ban co » san co
x hoi » xa hoi, o hoi, x ho
ve cu » ve cau, ve chu, ve cua

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. hieu te ((ban co) or (ban do)) ((va hanh) or (va thanh)) ve cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu te ((ban co) OR (ban do)) ((va hanh) OR (va thanh)) ve cu tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu te ((ban co) or (ban do)) ((va hanh) or (va thanh)) ve cu tren*.