Perhaps you should try some spelling variations:
xquang tran » quang tran, quang tuan, xuan tran
chieu sach » chinh sach, chiet tach, chieu sang
quang toan » quang tuan, quang tran, quang doan
doi chieu » doc hieu, doi chi, mot chieu
cong tap » cuong tap, cong tac, cong tan
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - anh ((xquang tran) OR (quang toan)) nhung ((cong tap) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - anh ((xquang tran) OR (quang toan)) nhung ((cong tap) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - anh ((xquang tran) OR (quang toan)) nhung ((cong tap) or (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh ((xquang tran) OR (quang toan)) nhung ((cong tap) or (cong san)) toan cau*.