Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
manh han » manh hai, manh hon, anh han
tai cua » thai cua, tai cuc, tri cua
han tai » hang tai, nhan tai, van tai
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
tu nang » tru nang, tu nong, tu nano
ve cac » va cac, vien cac
ma hoi » mai hoi, ma hoa, me hoi
ve cai » va cai, ve tai, ve cau

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 tu nang ((ma hoi) or (xa hoi)). hieu ((ve cai) or (ve cac)) suc manh han tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu nang ((ma hoi) OR (xa hoi)). hieu ((ve cai) OR (ve cac)) suc manh han tai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach tu nang ((ma hoi) or (xa hoi)). hieu ((ve cai) or (ve cac)) suc manh han tai cua tre*.