Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
ve triet » va trien
ban hang » ngan hang
van nhan » van phan, van thanh, danh nhan
nhan duc » nhan duoc, nhan luc, phan duc
su triet » su viet, su tien
nang xa » nang x, lang xa, nang ma
duc ban » duc tan, duc van, dua ban
tu sach » su sach, te sach, tu cach
hang di » hang doi, hang vi, hang dien

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (tu sach)) ky nang xa hoi. hieu van nhan duc ban hang di ((ve triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang xa hoi. hieu van nhan duc ban hang di ((ve triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky nang xa hoi. hieu van nhan duc ban hang di ((ve triet) or (su triet))*.