Perhaps you should try some spelling variations:
khanh hoa » thanh hoa, hang hoa
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
cuu tong » cuu cong, cuu tinh, huu tung
o khanh » _ khanh, hoa khanh, le khanh
va nhan » van nhan, va phan, va nha
tong o » thong o, trong o, dong o
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 tap, nghien cuu tong o khanh hoa hoc xa hoi ((va nhan) OR (ca nhan)) dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu mach hoc tap, nghien cuu tong o khanh hoa hoc xa hoi ((va nhan) OR (ca nhan)) dan".
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu tong o khanh hoa hoc xa hoi ((va nhan) OR (ca nhan)) dan*.