Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
trang va » hang va
tran van » luan van
san cau » van cau, ban cau, ran cau
can cau » van cau, ban cau, ca cau

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 xanh - manh ((trang va) OR (tran van)) hang cong trinh ((san cau) or (can cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - manh ((trang va) OR (tran van)) hang cong trinh ((san cau) OR (can cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - manh ((trang va) OR (tran van)) hang cong trinh ((san cau) or (can cau))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - manh ((trang va) OR (tran van)) hang cong trinh ((san cau) or (can cau))*.