Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hang hoi » hang hoa, hang hai, hang doi
ban hang » ngan hang
cham cua » chat cua, cham cuu, ham cua
hoi cua » hoi chuc
va cham » va chat, va tham
hieu va » lieu va, hieu qua
dai hai » dai han, dai tai, dai thao
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai moi
mai doi » moi doi, mai hoi, mai khoi
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((mai doi) or (((dai hoi) or (dai hai)))). hieu va cham cua ban hang hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((mai doi) OR (((dai hoi) OR (dai hai)))). hieu va cham cua ban hang hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((mai doi) or (((dai hoi) or (dai hai)))). hieu va cham cua ban hang hoi cua tre*.