Perhaps you should try some spelling variations:
sach daon » sach danh, sach dat, sach han
sach dao » lanh dao
van hanh » van thanh, ban hanh, van anh
su triet » su viet, ve triet
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
su tien » su kien, su hien, tu tieng
xu van » tu van, vu van, su van

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 chao xu van 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 chao xu van 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 chao xu van hanh vi ((su triet) or (su tien))*.