Perhaps you should try some spelling variations:
cham dung » chan dung, pham dung, chao mung
dung ngan » dung nhan, dung luan
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
cuu tre » cau tren, cau treo
hang ho » hang hoa, hang cho, hang ha
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
cua tre » cua te, cua triet, dua tren

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 ((mai hoi) or (dai hoi)). hieu ve cham dung ngan hang ho ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((mai hoi) OR (dai hoi)). hieu ve cham dung ngan hang ho ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((mai hoi) or (dai hoi)). hieu ve cham dung ngan hang ho ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((mai hoi) or (dai hoi)). hieu ve cham dung ngan hang ho ((cuu tre) OR (cua tre))*.