Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
manh xay » nganh xay, van xay, mang xa
dang xay » dang van, van xay
duc manh » suc manh, duc anh, duc minh
duc ban » duc tan, duc van, dua ban
thi cua » thai cua, thi cuc, tri cua
anh thi » anh tho, dinh thi, dang thi
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((manh xay) OR (dang xay)) hoi. hieu ve cam ((duc ban) OR (duc manh)) anh thi cua tre~.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((manh xay) or (dang xay)) hoi. hieu ve cam ((duc ban) or (duc manh)) anh thi cua tre*.