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
sach thu » sach thue, sach thieu, sach tham
thu trac » thi trac, tu trac, thu trang
thuoc la » thuoc ma, thuoc va, thuoc tai
nhan dan » phan dau, nhan tai
gian dan » gian lang
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
la hoi » lai hoi, xa hoi, le hoi

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 thu trac, nghien cuu mot hoc nganh dong thuoc la hoi va ((nhan dan) or (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu trac, nghien cuu mot hoc nganh dong thuoc la hoi va ((nhan dan) OR (gian dan)).
• Adding a wildcard symbol may retrieve word variants: tu sach thu trac, nghien cuu mot hoc nganh dong thuoc la hoi va ((nhan dan) or (gian dan))*.