Perhaps you should try some spelling variations:
sach thu » sach thue, sach tham, cach thuc
cham duc » pham duc, cham soc, pham duy
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va doan » va doanh, van doan, va dan
van cau » van hau, van chat, toan cau
van dau » van dao, phan dau

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 thu) or (sach thieu)) nang xa hoi. hieu ve cham duc va doan ((van cau) OR (van dau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thieu)) nang xa hoi. hieu ve cham duc va doan ((van cau) OR (van dau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) or (sach thieu)) nang xa hoi. hieu ve cham duc va doan ((van cau) OR (van dau)) treo".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach thieu)) nang xa hoi. hieu ve cham duc va doan ((van cau) OR (van dau)) treo*.