Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, hieu binh
kieu tinh » lieu tinh, trieu tinh, diep tinh
cong dung » cuong dung, cong dong, cong luong
dung van » duong van, dung va, dang van
cong da » cong dan, cong dac, cong dau
da cong » dai cong, dam cong, va cong
van van » tan van, san van, van vat

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 da cong dung van van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (kieu tinh)) - thanh cong da cong dung van van ban*.