Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu te » hieu ve, hien te, hieu he
va hanh » van hanh, va thanh, va danh
te ban » te bao
ban co » ban do, san 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: vu sach ky nang x hoi. hieu te ban co ((va hanh) or (ban thanh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu te ban co ((va hanh) OR (ban thanh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu te ban co ((va hanh) or (ban thanh)) vi cau tren*.