Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
hoc nganh » hoc nhanh
nhan tain » nhan dan, nhan tao, han tai
hach hoi » hoach hoi, sach hoi, cach thoi
thuoc xa » thuoc ma, thuoc va, thuoc la
nhan tai » hang tai, van tai, toan tai
tu hach » tu hanh, tu cach, tu sach
hoi tai » hoc tai, hoi trac
mo hoc » mon hoc, co hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu hach hoi tai, nghien cuu mo hoc nganh khong thuoc xa hoi va ((nhan tain) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hach hoi tai, nghien cuu mo hoc nganh khong thuoc xa hoi va ((nhan tain) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: tu hach hoi tai, nghien cuu mo hoc nganh khong thuoc xa hoi va ((nhan tain) or (nhan tai))*.