Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, hieu binh
kieu tinh » lieu tinh, trieu tinh, diep tinh
cong dang » cong dong, cong dan, cong dung
cong dap » cong dan, cong lap, cong da
dap cong » tap cong, dai cong, dam cong
dang tan » dang tran, dang toan, dang van
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu tinh) or (kieu tinh)) - thanh cong dap cong dang tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (kieu tinh)) - thanh cong dap cong dang tan van ban*.