Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh quan » tinh quang, trinh luat, trinh han
thong cong » trong cong, tong cong, phong chong
doi chieu » doc hieu, doi chi, ho chieu
trinh qua » trinh cua, trinh quang, trinh luat
nang phan » nang phat, nang thanh, nang quan
phan cau » phan dau, phan cac, phan tu

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 - hanh ((trinh qua) OR (trinh quan)) ((thong cong) or (thong thong)) nang phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trinh qua) OR (trinh quan)) ((thong cong) OR (thong thong)) nang phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((trinh qua) OR (trinh quan)) ((thong cong) or (thong thong)) nang phan cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((trinh qua) OR (trinh quan)) ((thong cong) or (thong thong)) nang phan cau*.