Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
manh dai » manh hai, vanh dai, manh khai
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
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 ky) OR (sach ty)) lang xa hoi. hieu van cam ((quoc ban) or (duc va)) manh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) lang xa hoi. hieu van cam ((quoc ban) OR (duc va)) manh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) lang xa hoi. hieu van cam ((quoc ban) or (duc va)) manh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) lang xa hoi. hieu van cam ((quoc ban) or (duc va)) manh dai cua tre*.