Perhaps you should try some spelling variations:
nphan cong » pham cong, phap cong, phan cung
chieu sach » chinh sach, chiet tach, chieu sang
doc chieu » doc hieu, doi chieu, toc thieu
phan cong » thanh cong
dan dung » van dung, tin dung, ap dung
dung dat » dung va, dung tai
dat van » dao van, dat va, dam van
van phi » van chi, van phu, van nhi
phi dau » phan dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc chieu sach - ((phan cong) or (nphan cong)) dan dung dat van phi dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc chieu sach - ((phan cong) OR (nphan cong)) dan dung dat van phi dau.
• Adding a wildcard symbol may retrieve word variants: doc chieu sach - ((phan cong) or (nphan cong)) dan dung dat van phi dau*.