Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quan » lieu quan, thien quan, lien quan
lanh manh » lanh tranh, lan anh, van manh
cua thong » cua thuong, cua khong, cua tong
thong tan » thong than, thong tran, thong tin
manh cua » doanh cua, ban cua
tan toan » tan tran, tap toan, van toan
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: hoc ((chieu sang) or (((hieu quan) or (hieu qua)))) - lanh manh cua thong thong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (((hieu quan) OR (hieu qua)))) - lanh manh cua thong thong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (((hieu quan) or (hieu qua)))) - lanh manh cua thong thong tan toan cau*.