Perhaps you should try some spelling variations:
quan trong » gian trong
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
cua trong » cua truong, cua trung, qua trong
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
than tap » han tap, phan tap, than cap
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - anh tang ((cua trong) OR (quan trong)) cong tac ((than tap) OR (toan tap))~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - anh tang ((cua trong) or (quan trong)) cong tac ((than tap) or (toan tap))*.