Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
va doanh » van doanh, va danh, hoa doanh
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
ve chat » va chat, van chat
sach ky » sac ky, sach y, sach ty
ve cham » va cham, vu cham, ve chim
nang xa » nang x, lang xa, nang ma
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 ky nang xa hoi. hieu ((ve cham) OR (ve chat)) cuu ((va doanh) or (vay doanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((ve cham) OR (ve chat)) cuu ((va doanh) OR (vay doanh)) tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((ve cham) OR (ve chat)) cuu ((va doanh) or (vay doanh)) tai cua tre*".