Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
cua nhung » va nhung
anh nang » ganh nang, anh bang, anh sang
anh dang » anh dong, anh dung, anh bang
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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: theo ((chieu sach) or (hieu lang)) - ((anh nang) OR (anh dang)) cua nhung cong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu lang)) - ((anh nang) OR (anh dang)) cua nhung cong bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (hieu lang)) - ((anh nang) OR (anh dang)) cua nhung cong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (hieu lang)) - ((anh nang) OR (anh dang)) cua nhung cong bai toan cau*.