Perhaps you should try some spelling variations:
nghien huoc » nghiem thuoc, nghiem duoc, nghiem nuoc
nganh dong » nganh cong, nhanh dong, nganh nong
dong thuoc » dung thuoc, dang thuoc, don thuoc
goc nganh » hoc nganh, hoc nhanh, cac nganh
cach hoc » cach thuc, cach thoi, dich hoc
huoc mot » hoc mot, huong mot, thuoc moi
thuoc ma » hoc ma, duoc ma
tu cach » tu cac
hoi van » hoi va, hoi dan, hoi han
hai van » thai van, ha van, hai tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach hoc tap, nghien huoc mot goc nganh dong thuoc ma ((hoi van) or (hai van)) von tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach hoc tap, nghien huoc mot goc nganh dong thuoc ma ((hoi van) OR (hai van)) von tai.
• Adding a wildcard symbol may retrieve word variants: tu cach hoc tap, nghien huoc mot goc nganh dong thuoc ma ((hoi van) or (hai van)) von tai*.