Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
qua trong » quan trong, qua trinh, qua song
ca trong » cay trong, cad trong, co trong
cong san » cong tac
toan cao » toan ban
toan tap » toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh tranh ((ca trong) OR (qua trong)) cong san ((toan cao) OR (toan tap))~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh tranh ((ca trong) or (qua trong)) cong san ((toan cao) or (toan tap))*.