Perhaps you should try some spelling variations:
ban than » ban thanh, van thanh, ban hang
than tri » thanh tri, tran tri, tham tri
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
van cam » van lam, van cau, van dam
xuc ban » duc ban, cuc ban, quoc ban
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sac ky)) nang xa hoi. hieu ((van cam) or (van nam)) xuc ban than tri cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang xa hoi. hieu ((van cam) OR (van nam)) xuc ban than tri cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang xa hoi. hieu ((van cam) or (van nam)) xuc ban than tri cua tu".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) nang xa hoi. hieu ((van cam) or (van nam)) xuc ban than tri cua tu*.