Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
vien dai » hien dai
ban hanh » ban hang
va thanh » gia thanh, ban thanh, va tinh
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
dai xuc » dai xu, dai luoc, dai thuc
va hanh » van hanh, va danh, dao hanh
vi cau » va cau, ve cau, di cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang cao hoi. hieu vien dai xuc ((((va hanh) or (ban hanh))) or (va thanh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang cao hoi. hieu vien dai xuc ((((va hanh) OR (ban hanh))) OR (va thanh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang cao hoi. hieu vien dai xuc ((((va hanh) or (ban hanh))) or (va thanh)) vi cau tren*.