Perhaps you should try some spelling variations:
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nganh » hoc nhanh
khong hoc » khung hoc, thong hoc, khong thuoc
tran phan » toan phan, than phan, tra phan
sach doi » sach hoi, sach moi, sach dao
hai tran » thai tran, hai tan, ha tran
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
xua hai » qua hai, cua hai, xa hai
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 sach doi tap, nghien cuu mo hoc nganh ((khong hoc) or (dong thuoc)) xua hai tran phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien cuu mo hoc nganh ((khong hoc) OR (dong thuoc)) xua hai tran phan van*.