Perhaps you should try some spelling variations:
dong thuoc » dung thuoc, dang thuoc, don thuoc
nganh dong » nganh cong, nhanh dong, nganh nong
hoc nganh » hoc nhanh
sach moi » sach doi, bach mai, sach bai
thuoc ma » hoc ma, duoc ma
gian dan » gian lang
sach hoi » sach doi, cach thoi, hoach hoi
cuu mon » cuu mo, cuu mot, cuu cong
ca gian » ca giang, ca giao, va gian
mon hoc » toan hoc, dong hoc
ma hoi » mai hoi, xa hoi, ma hoa
hoi ca » hoi cua, hoi cac, hoi cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach moi) OR (sach hoi)) tap, nghien cuu mon hoc nganh dong thuoc ma hoi ca gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach moi) OR (sach hoi)) tap, nghien cuu mon hoc nganh dong thuoc ma hoi ca gian dan*".