Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
lang van » dang van, tang van, hoang van
luc van » luoc van, luu van, duc van
cau luc » cau truc, cau phuc
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
tai va » thai va, tri va, dai va
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang xa) or (lang van)) hoi. hieu ve cau luc van hanh ((tai va) or (mai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (lang van)) hoi. hieu ve cau luc van hanh ((tai va) OR (mai va)) triet.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (lang van)) hoi. hieu ve cau luc van hanh ((tai va) or (mai va)) triet*.