Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » chieu sang, nhieu tang, hieu van
hanh mang » nhanh mang, hanh trang, nhanh lang
cua thong » cua thuong, cua khong, suat thong
cua tong » cua cong, cua dong, cua nong
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 ((hieu lang) OR (hieu quang)) - hanh mang ((cua thong) or (cua tong)) cong trinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu quang)) - hanh mang ((cua thong) OR (cua tong)) cong trinh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) OR (hieu quang)) - hanh mang ((cua thong) or (cua tong)) cong trinh toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) OR (hieu quang)) - hanh mang ((cua thong) or (cua tong)) cong trinh toan cao*.