Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, hieu van
trang van » tran van, trong van, tang van
trinh han » trinh quan
trang va » tran van, hang va
han cau » hang cau, phan cau, van cau

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

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