Perhaps you should try some spelling variations:
sach tham » sach nha
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
tan hanh » tan thanh, tang hanh, toan hanh
hanh dao » lanh dao, thanh dat, thanh dam
ve triet » va trien, su triet
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
soc tan » hoc tan, so tan, soc dan
dao ve » bao ve, dap ve, dau ve

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 ty) or (sach tham)) nang xa hoi. hieu van cham soc tan hanh dao ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tham)) nang xa hoi. hieu van cham soc tan hanh dao ve triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tham)) nang xa hoi. hieu van cham soc tan hanh dao ve triet*.