Perhaps you should try some spelling variations:
khanh hoa » thanh hoa, hang hoa
mach hoc » cach hoc, anh hoc, bac hoc
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu dong » cuu cong, cuu tong, cuu long
nhan dan » phan dau, gian dan, nhan tai
o khanh » _ khanh, hoa khanh, le khanh
va nhan » van nhan, ca nhan, va phan
dong o » dong co, duong o, dong ho
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((mach hoc) OR (dich hoc)) tap, nghien cuu dong o khanh hoa hoc xa hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((mach hoc) OR (dich hoc)) tap, nghien cuu dong o khanh hoa hoc xa hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: thu ((mach hoc) OR (dich hoc)) tap, nghien cuu dong o khanh hoa hoc xa hoi va nhan dan*.