Perhaps you should try some spelling variations:
nganh dong » nganh cong, nhanh dong, nganh nong
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nganh » hoc nhanh
thuoc mai » thuoc ma, thuoc tai, thuoc moi
sach hoc » cach hoc, sach hoi, mach hoc
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
mai hoi » mai khoi, dai hoi, lai hoi
van tai » van tuan

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 mot hoc nganh dong thuoc mai hoi va ((van tai) OR (von tai))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu mot hoc nganh dong thuoc mai hoi va ((van tai) OR (von tai))".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mot hoc nganh dong thuoc mai hoi va ((van tai) OR (von tai))*.