Perhaps you should try some spelling variations:
sach daon » sach danh, sach dat, sach han
sach dao » lanh dao
su triet » su viet, ve triet
ban hanh » ban hang
duc ban » duc tan, duc van, dua ban
su tien » su kien, su hien, tu tieng
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac

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 daon) or (sach dao)) nang xa hoi. hieu ve cac duc ban hanh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach daon) OR (sach dao)) nang xa hoi. hieu ve cac duc ban hanh vi ((su triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach daon) or (sach dao)) nang xa hoi. hieu ve cac duc ban hanh vi ((su triet) or (su tien))*.