Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hang hoi » hang hoa, hang hai, hang doi
ban hang » ngan hang
thuc ban » thuoc ban, thuc dan, thu ban
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
he nam » ha nam, nghe nam
hoi su » hoi suc, khoi su, thoi su
ve nam » va nam, le nam, te nam

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 ky) OR (sach y)) nang xa hoi. hieu ((ve nam) or (he nam)) thuc ban hang hoi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach y)) nang xa hoi. hieu ((ve nam) OR (he nam)) thuc ban hang hoi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sach y)) nang xa hoi. hieu ((ve nam) or (he nam)) thuc ban hang hoi su triet*".