Perhaps you should try some spelling variations:
thanh tung » thanh cong
hoc thieu » hoc hien
dung cong » dung trong
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
san cau » ban cau, can cau, ran cau
van cau » van dau, van hau, van chat

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