Perhaps you should try some spelling variations:
khong hoc » khung hoc, thong hoc, khong thuoc
chung hoc » trung hoc, dung hoc, hung hoa
van thanh » ban thanh, van tuan
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
hoi van » hoi va, hoi dan, hai van

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 hoc tap, nghien cuu dong luc canh ((khong hoc) or (chung hoc)) xa hoi van thanh va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu dong luc canh ((khong hoc) OR (chung hoc)) xa hoi van thanh va.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong luc canh ((khong hoc) or (chung hoc)) xa hoi van thanh va*.