Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
luc nganh » luc ngan, chuc nganh, luat nganh
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
cong hoc » dong hoc, cong hoa, cong coc
phan tao » nhan tao, phan tap, phan tan
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
dai hai » dai han, dai hoi, dai tai
va phan » van phan, va phat, va phap

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 cong hoc ((mai hoi) or (dai hai)) va phan tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu dong luc nganh cong hoc ((mai hoi) OR (dai hai)) va phan tao.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong luc nganh cong hoc ((mai hoi) or (dai hai)) va phan tao*.