Perhaps you should try some spelling variations:
sach tru » sach truc, sach tu, sach tren
sach thu » sach thue, sach thieu, sach tham
danh van » doanh van, dang van, dinh van
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac luc » cau luc, coc luc, cac nuoc
va danh » va dinh, va dan, va hanh
van cua » vang cua, ban cua, dan cua
luc va » duc va, tuc va, loc va
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 tru) or (sach thu)) nang xa hoi. hieu qua cac luc va danh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tru) OR (sach thu)) nang xa hoi. hieu qua cac luc va danh van cua te.
• Adding a wildcard symbol may retrieve word variants: toc ((sach tru) or (sach thu)) nang xa hoi. hieu qua cac luc va danh van cua te*.