Perhaps you should try some spelling variations:
qua cham » qua cac, va cham, qua cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
qua hai » qua hoat
duc ban » duc van, dua ban, duc man
cua tre » cua te, cuu tre, cua triet
anh da » anh dat, anh d, anh va
da cua » dai cua, day cua, dan cua
x hoi » xa hoi, o hoi, x ho

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 ((qua cham) or (qua hai)) ((duc ban) OR (duc tan)) anh da cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ((qua cham) OR (qua hai)) ((duc ban) OR (duc tan)) anh da cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ((qua cham) or (qua hai)) ((duc ban) OR (duc tan)) anh da cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((qua cham) or (qua hai)) ((duc ban) OR (duc tan)) anh da cua tre*.