Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
va doanh » van doanh, va danh, hoa doanh
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang xa hoi. hieu va cac tu ((va doanh) OR (vay doanh)) van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang xa hoi. hieu va cac tu ((va doanh) OR (vay doanh)) van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang xa hoi. hieu va cac tu ((va doanh) OR (vay doanh)) van cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang xa hoi. hieu va cac tu ((va doanh) OR (vay doanh)) van cua tre*.