Perhaps you should try some spelling variations:
quang trong » quang truong, quang trung, quan trong
nhiet tach » chiet tach
hanh trinh » canh tranh, hanh chinh
hoc nhiet » hoc thiet, hoc nghien, hoc hien
hanh tinh » nhanh tinh, thanh tinh, canh tinh
than ban » thanh ban, toan ban, than man
ty than » ty thanh, te than, tu than

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 nhiet tach - ((hanh tinh) OR (hanh trinh)) quang trong cong ty than ban~.
• Adding a wildcard symbol may retrieve word variants: hoc nhiet tach - ((hanh tinh) or (hanh trinh)) quang trong cong ty than ban*.