Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho
d cua » de cua, do cua, da cua

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 ky nang x hoi. hieu ve cam ((duc ban) or (cua ban)) anh d cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve cam ((duc ban) OR (cua ban)) anh d cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve cam ((duc ban) or (cua ban)) anh d cua tre*.