Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban thanh » ban hanh, ban hang
hang hoa » hang khoa, thanh hoa, hang va
hoa hoi » khoa hoi, hoa hoc, hoa doi
sach ky » sac ky, sach y, sach ty
cac ban » cac dan, cac van, can ban
ky hang » ky nang, ly hang, ky dang
va tao » va bao, va tac, va tap
va cao » va cac, va co, va dao
van ve » van de, van le, van vu
ban ve » ban va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky hang hoa hoi. hieu ((va tao) OR (va cao)) cac ban thanh ((van ve) or (ban ve)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky hang hoa hoi. hieu ((va tao) OR (va cao)) cac ban thanh ((van ve) OR (ban ve)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky hang hoa hoi. hieu ((va tao) OR (va cao)) cac ban thanh ((van ve) or (ban ve)) triet*".