Perhaps you should try some spelling variations:
nhan khung » nha khung, nhan khong, nha chung
khung hoc » chung hoc, nhung hoc, thuong hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
luc nhan » luc nhat, cu nhan, tue nhan
phan tai » pham tai, nhan tai, phan thi
tu sach » thu sach, su sach, te sach
so sach » so sanh, bo sach, co sach
hoi tap » hoi dap, hoc tap, hoi tai
vo phan » co phan, va phan, so phan
hoa vo » hoa co

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) or (so sach)) hoi tap, nghien cuu dong luc nhan khung hoc ma hoa vo phan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) hoi tap, nghien cuu dong luc nhan khung hoc ma hoa vo phan tai.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) hoi tap, nghien cuu dong luc nhan khung hoc ma hoa vo phan tai*.