Perhaps you should try some spelling variations:
cong khanh » cong thanh, cong khan, cong nhan
lieu tinh » trieu tinh, diep tinh, bien tinh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
cong dan » cong san, cong tan, huong dan
toan cao » toan ban, toan tap
sinh va » sinh vat, tinh va, dinh van
va cong » tai cong, cua cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: du lieu tinh - hanh sinh va cong ((cong dan) or (cong khanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: du lieu tinh - hanh sinh va cong ((cong dan) OR (cong khanh)) toan cao.
• Adding a wildcard symbol may retrieve word variants: du lieu tinh - hanh sinh va cong ((cong dan) or (cong khanh)) toan cao*.