Perhaps you should try some spelling variations:
thanh trung » thanh tung
duong thanh » dong thanh, muong thanh, dung thanh
luong thanh » muong thanh, truong thanh, dong thanh
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
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 - ((hanh trinh) or (thanh trung)) va nhung ((duong thanh) OR (luong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((hanh trinh) OR (thanh trung)) va nhung ((duong thanh) OR (luong thanh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((hanh trinh) or (thanh trung)) va nhung ((duong thanh) OR (luong thanh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((hanh trinh) or (thanh trung)) va nhung ((duong thanh) OR (luong thanh)) toan cao*.