Perhaps you should try some spelling variations:
tuong thanh » truong thanh, muong thanh, duong thanh
luong thanh » muong thanh, truong thanh, dong thanh
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trinh, hanh trang
doi chieu » doc hieu, doi chi, ho chieu
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 tranh) or (hanh chinh)) va nhung ((tuong thanh) OR (luong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((hanh tranh) OR (hanh chinh)) va nhung ((tuong thanh) OR (luong thanh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((hanh tranh) or (hanh chinh)) va nhung ((tuong thanh) OR (luong thanh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((hanh tranh) or (hanh chinh)) va nhung ((tuong thanh) OR (luong thanh)) toan cao*.