Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cau tren » cu tren, dau tren, ca tren
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
te ban » te bao
ban bo » can bo, ban do, ban co
vi cau » va cau, ve cau, di cau
x hoi » xa hoi, o hoi, x ho

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 bo ((va hanh) OR (va thanh)) vi cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu te ban bo ((va hanh) OR (va thanh)) vi cau tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu te ban bo ((va hanh) OR (va thanh)) vi cau tren*.