Perhaps you should try some spelling variations:
chieu chien » thien chien, hieu hien
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
da thanh » dao thanh, dat thanh, dam thanh
thanh ki » thanh kim, thanh ky, thanh ke
su triet » su viet, su tien, ve triet
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
cac tac » cac toc, cac bac, cac dac
lang o » lang _, tang o, lang son
o hoi » co hoi, o hoc, o hai
ki su » ky su

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 lang o hoi. ((hieu vien) or (chieu chien)) cac tac da thanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty lang o hoi. ((hieu vien) OR (chieu chien)) cac tac da thanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ty lang o hoi. ((hieu vien) or (chieu chien)) cac tac da thanh ki su triet*.