Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, hoa doanh
vang cua » mang cua, hang cua, tang cua
sach thu » sach thue, sach thieu, sach tham
va danh » va dinh, va dan, va hanh
cao luc » bao luc, cao duc, cao suc
sach tu » cach tu, sach ty, sach uu
qua cao » qua cac, qua ca, qua cai
nang xa » nang x, lang xa, nang ma
cua te » cua tu

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

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