Perhaps you should try some spelling variations:
phuong thanh » phong thanh, truong thanh, muong thanh
phuong thao » phuong phap, phuong thuc
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
thang va » trang va, thong va, thanh va
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - hanh ((thang va) OR (hang va)) dung ((phuong thanh) or (phuong thao)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - hanh ((thang va) OR (hang va)) dung ((phuong thanh) OR (phuong thao)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - hanh ((thang va) OR (hang va)) dung ((phuong thanh) or (phuong thao)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh ((thang va) OR (hang va)) dung ((phuong thanh) or (phuong thao)) toan cau*.