Perhaps you should try some spelling variations:
thuong luong » theo luong, cong luong, thong thuong
phuong luong » phuong duong, phuong dung, chuong duong
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cao toan » bao toan, cao tan, cao doanh
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 ((thieu sang) or (chieu sang)) - hanh tranh cua ((phuong luong) OR (thuong luong)) cao toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - hanh tranh cua ((phuong luong) OR (thuong luong)) cao toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sang)) - hanh tranh cua ((phuong luong) OR (thuong luong)) cao toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sang)) - hanh tranh cua ((phuong luong) OR (thuong luong)) cao toan cao*.