Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh quan » tinh quang, trinh luat, trinh han
tieu xanh » tieu danh, chieu xanh, dieu hanh
tang vat » tang van, dang vat, bang vat
trang va » tran van, hang va
quan cau » quang cao, toan cau, quan ha
tang va » tang van, thang va, hang va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - hanh ((((tang va) OR (tang vat))) or (trang va)) nhung cong trinh quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - hanh ((((tang va) OR (tang vat))) OR (trang va)) nhung cong trinh quan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh ((((tang va) OR (tang vat))) or (trang va)) nhung cong trinh quan cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh ((((tang va) OR (tang vat))) or (trang va)) nhung cong trinh quan cau*.