Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hang tai » hang va, dung tai
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
cac ban » cac dan, cac van, can ban
cua tre » cua te, cuu tre, cua triet
cuc ban » cua ban, cuu ban, duc ban
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
va cam » va cham, va cac, va cao

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

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