Perhaps you should try some spelling variations:
dong thanh » truong thanh
doi chieu » doc hieu, ho chieu, mot chieu
nang hang » nang sang, hang hang, cang thang
thanh dan » thanh san, thanh van, thanh dat
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
doi chi » doi khi
hang xa » hoang xa, hang va, hang ca
xa dong » ha dong, van dong, lao dong

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) or (doi chi)) tinh - nang hang xa dong thanh dan ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) tinh - nang hang xa dong thanh dan ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doi chi)) tinh - nang hang xa dong thanh dan ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) tinh - nang hang xa dong thanh dan ((toan cau) OR (toan tap))*.