Perhaps you should try some spelling variations:
cham dua » chay dua, cham giua, pham duc
hang tai » hang va, dung tai
hang hai » hoang hai, thanh hai, hang va
su sach » so sach, vu sach
dua ban » dia ban, cua ban, qua ban
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
cuu tre » cua tre, cau tren, cau treo

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 dua ban ((hang hai) OR (hang tai)) cuu 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 dua ban ((hang hai) OR (hang tai)) cuu 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 dua ban ((hang hai) OR (hang tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((mai hoi) or (dai hoi)). hieu ve cham dua ban ((hang hai) OR (hang tai)) cuu tre*.