Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
doanh dan » doanh ban, doanh van, doanh dao
hieu hien » dieu hien, chieu chien, dieu khien
va doanh » van doanh, vay doanh, va danh
bach mao » bach mai, bach giao, bach ha
tu sach » thu sach, te sach, tu cach
dan cua » dan ca, ban cua, dai cua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
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 hoi. ((hieu hien) OR (bieu hien)) bach mao va doanh dan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu hien) OR (bieu hien)) bach mao va doanh dan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. ((hieu hien) OR (bieu hien)) bach mao va doanh dan cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. ((hieu hien) OR (bieu hien)) bach mao va doanh dan cua tre*.