Perhaps you should try some spelling variations:
khong thong » thong thong, khong trong, thong thuong
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
cua khong » hua khong, cua phuong, cua thuong
thong va » thong cua, truong va, thong qua
than cao » thai cao, than cap, than sao
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: hoc thieu xanh - ((thanh trung) or (canh tranh)) cua khong thong va ((than cao) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((thanh trung) OR (canh tranh)) cua khong thong va ((than cao) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((thanh trung) or (canh tranh)) cua khong thong va ((than cao) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((thanh trung) or (canh tranh)) cua khong thong va ((than cao) OR (toan cao))*.