Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
bach mao » bach mai, bach giao, bach ha
tu sach » thu sach, te sach, tu cach
van cua » vang cua, ban cua, dan cua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
mao va » mao van, tao va, cao va

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) or (su sach)) ky ((nang xa) OR (lang xa)) hoi. hieu vien bach mao va doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky ((nang xa) OR (lang xa)) hoi. hieu vien bach mao va doanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky ((nang xa) OR (lang xa)) hoi. hieu vien bach mao va doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky ((nang xa) OR (lang xa)) hoi. hieu vien bach mao va doanh van cua tre*.