Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
minh hai » minh khai, tinh hai, manh hai
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
van lam » van nam
dang xa » dang xay, dang ha, dang va
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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 ty ((dang xa) or (lang xa)) hoi. hieu van lam ((quoc ban) or (duc tan)) minh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((dang xa) OR (lang xa)) hoi. hieu van lam ((quoc ban) OR (duc tan)) minh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((dang xa) or (lang xa)) hoi. hieu van lam ((quoc ban) or (duc tan)) minh hai cua tre*.