Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thieu sang » chieu sang, thieu khang, thieu quang
nhung cong » thong cong, hang cong, nhung don
hoc thieu » toc thieu, hoc hien
hanh tram » hanh tam, hanh trang, thanh tran
dung cong » dung trong
toan ban » van ban

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 tram) or (hanh trinh)) thuat ((nhung cong) OR (dung cong)) tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((hanh tram) OR (hanh trinh)) thuat ((nhung cong) OR (dung cong)) tinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - ((hanh tram) or (hanh trinh)) thuat ((nhung cong) OR (dung cong)) tinh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((hanh tram) or (hanh trinh)) thuat ((nhung cong) OR (dung cong)) tinh toan ban*.