Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
hach toan » thanh toan, manh toan
than cua » nhan cua, ban cua, gian cua
thai cua » tai cuc, tri cua, dai cua
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 - hanh ((than cua) or (thai cua)) ((nhung cong) OR (dung cong)) hach toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((than cua) OR (thai cua)) ((nhung cong) OR (dung cong)) hach toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((than cua) or (thai cua)) ((nhung cong) OR (dung cong)) hach toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((than cua) or (thai cua)) ((nhung cong) OR (dung cong)) hach toan cao*.