Perhaps you should try some spelling variations:
khanh phuong » khanh phong, thanh phuong, khanh phung
phuong hoa » huong hoa, phuong hoang, hung hoa
sach doi » sach hoi, sach moi, sach dao
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
lang co » lang o, tang co, lang son
nang co » nang cao, nang doc, nang noi
va nhan » van nhan, ca nhan, va phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach doi tap, nghien cuu ((lang co) or (nang co)) khanh phuong hoa xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien cuu ((lang co) OR (nang co)) khanh phuong hoa xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien cuu ((lang co) or (nang co)) khanh phuong hoa xa hoi va nhan dan*.