Perhaps you should try some spelling variations:
nhung chong » nhung cong, nhung phong, nhung phuong
chieu sang » chieu sach, chieu xanh, hieu lang
hanh nhung » anh nhung, canh nhung, doanh nhung
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, anh quan, tinh quang
tham toan » tam toan, thuat toan, thanh toan
pham toan » pham tuan, pham tan, phap toan

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 sang - ((anh quang) or (nhanh quang)) hanh nhung chong ((tham toan) OR (pham toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((anh quang) OR (nhanh quang)) hanh nhung chong ((tham toan) OR (pham toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((anh quang) or (nhanh quang)) hanh nhung chong ((tham toan) OR (pham toan)) cao".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((anh quang) or (nhanh quang)) hanh nhung chong ((tham toan) OR (pham toan)) cao*.