Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
trung cap » truong cao, trung tam
phan cong » thanh cong
han cong » hang cong, hanh cong, han tong
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: theo ((chieu sang) or (hieu quang)) - thanh trung cap ((han cong) OR (phan cong)) tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu quang)) - thanh trung cap ((han cong) OR (phan cong)) tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) or (hieu quang)) - thanh trung cap ((han cong) OR (phan cong)) tan toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) or (hieu quang)) - thanh trung cap ((han cong) OR (phan cong)) tan toan cau*.