Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hang hoa » hang khoa, thanh hoa, hang va
hang hoi » hang hai, hang doi, hang loi
thuc ban » thuoc ban, thuc dan, thu ban
sach ty » sach y, sach tu, sach thu
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ve nam » he nam, le nam, te nam
ma hoi » mai hoi, xa hoi, ma hoa
va nam » van nam, ha nam, va nay

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