Perhaps you should try some spelling variations:
dieu tra » kiem tra, dieu cua
ban hang » ngan hang
su sach » so sach, vu sach
hai hoi » dai hoi, hai moi, hai hoa
hai hai » khai hai, dai hai, tai hai
sach ky » sac ky, sach y, sach ty
cao xuc » cam xuc, cao duc, cao suc
xuc ban » duc ban, cuc ban, quoc ban
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((hai hoi) or (hai hai)). lieu va cao xuc ban hang ((dieu tra) OR (dieu tri)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((hai hoi) OR (hai hai)). lieu va cao xuc ban hang ((dieu tra) OR (dieu tri)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((hai hoi) or (hai hai)). lieu va cao xuc ban hang ((dieu tra) OR (dieu tri)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((hai hoi) or (hai hai)). lieu va cao xuc ban hang ((dieu tra) OR (dieu tri)) te*.