Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
ban hang » ngan hang
quoc ban » quoc bao, quoc lan, quoc quan
dai quoc » mai quoc, dan quoc, da quoc
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang xa) or (tang ma)) hoi. hieu vien dai quoc ban hang ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (tang ma)) hoi. hieu vien dai quoc ban hang ((vi cua) OR (vai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (tang ma)) hoi. hieu vien dai quoc ban hang ((vi cua) or (vai cua)) tre*.