Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac cuc » cac cuoc, cac cua, cac nuoc
cuc ban » cua ban, cac ban, cuu ban
hai cua » thai cua, hoi cua, lai cua

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 y ((nang xa) or (lang van)) hoi. hieu qua cac cuc ban hanh ((hai cua) OR (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (lang van)) hoi. hieu qua cac cuc ban hanh ((hai cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (lang van)) hoi. hieu qua cac cuc ban hanh ((hai cua) OR (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (lang van)) hoi. hieu qua cac cuc ban hanh ((hai cua) OR (dai cua)) triet*.