Perhaps you should try some spelling variations:
cong phuong » cong thuong, cong huong, dong phuong
chieu khong » chien chong, chu khong, chieu duong
phuong thao » phuong phap, phuong thuc
thieu sang » chieu sang, thieu khang, thieu quang
hanh manh » hanh mang, lanh manh, hoang manh
manh cua » doanh cua, ban cua
tuan cau » toan cau, quan cau, thuan cam
tuan cu » tuan tu, quan cua, tuan thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sang) or (chieu khong)) - hanh manh cua cong phuong thao ((tuan cau) OR (tuan cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu khong)) - hanh manh cua cong phuong thao ((tuan cau) OR (tuan cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu khong)) - hanh manh cua cong phuong thao ((tuan cau) OR (tuan cu))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu khong)) - hanh manh cua cong phuong thao ((tuan cau) OR (tuan cu))*.