Perhaps you should try some spelling variations:
nganh chong » nganh cong, nhanh chong, nganh khong
luc nganh » luc ngan, chuc nganh, luat nganh
chong hoc » chung hoc, chong doc, thong hoc
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
tu sach » thu sach, su sach, te sach
hoa » khoa

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 nganh chong hoc ma hoa dan ((gian dan) or (gian lang))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu dong luc nganh chong hoc ma hoa dan ((gian dan) OR (gian lang)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong luc nganh chong hoc ma hoa dan ((gian dan) or (gian lang))*.