Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nhan khong » nhan thong, nhanh chong, nganh khong
khong hoc » khung hoc, thong hoc, khong thuoc
goc nhan » ngoc nhan, goc nhin, hoc nhan
van nhan » van phan, van thanh, danh nhan
nhan van » nhan dan, nhan va, phan van
tu manh » tu minh, tu hanh, tung manh
vu manh » vu minh, vu anh, suc manh
hoi van » hoi va, hoi dan, hai van
ma hoi » mai hoi, xa hoi, ma hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu manh) OR (vu manh)) hoc tap, nghien cua mot goc nhan khong hoc ma hoi van nhan van~.
• Adding a wildcard symbol may retrieve word variants: ((tu manh) or (vu manh)) hoc tap, nghien cua mot goc nhan khong hoc ma hoi van nhan van*.