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