Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
hieu hien » bieu hien, dieu hien, chieu chien
hien hanh » dieu hanh
hanh mao » hanh ma, hanh mau, hanh may
va doanh » van doanh, va danh, hoa doanh
dan cua » dan ca, ban cua, dai cua
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

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 hanh mao ((va doanh) OR (vay 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 hanh mao ((va doanh) OR (vay 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 hanh mao ((va doanh) OR (vay doanh)) dan cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu hien hanh mao ((va doanh) OR (vay doanh)) dan cua tre*.