Perhaps you should try some spelling variations:
nong thuoc » dong thuoc, long thuoc, khong thuoc
nganh nong » nganh cong
hoc nganh » hoc nhanh
gian dan » gian lang
cau gian » cau giay, hau giang, dan gian
thuoc va » thuc va, thuoc ma, thuong va
hoi cau » hoi chu, hoc cau, hoa cau
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu cong
moi tai » hoi tai, mo tai, moi thoi
moi tap » toi tap
mon hoc » toan hoc, dong hoc
va hoi » xa hoi, va hoc, va hoa

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 ((moi tap) OR (moi tai)), nghien cuu mon hoc nganh nong thuoc va hoi cau gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((moi tap) OR (moi tai)), nghien cuu mon hoc nganh nong thuoc va hoi cau gian dan*".