Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
trung cua » truong cua, trung tuan, trung cap
cong tinh » cong trinh, cong vinh, long tinh
toan cau » toan cao, toan ban, toan tap
hang ca » hang va, nang cao, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (hieu quang)) - hanh ((hang ca) or (trung cua)) nhung cong tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (hieu quang)) - hanh ((hang ca) OR (trung cua)) nhung cong tinh toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (hieu quang)) - hanh ((hang ca) or (trung cua)) nhung cong tinh toan cau*.