Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nganh nong » nganh cong
nong thuoc » dong thuoc, long thuoc, khong thuoc
hoc nganh » hoc nhanh
tung hoc » trung hoc, tuong hoc, dung hoc
thuoc xa » thuoc ma, thuoc va, thuoc la
tu sach » thu sach, su sach, te sach
hoi tai » hoc tai, hoi trac
phat va » chat va, pham va, phat vi

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 ((hoi tai) OR (hoc tap)), nghien huu tung hoc nganh nong thuoc xa hoi va phat va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((hoi tai) OR (hoc tap)), nghien huu tung hoc nganh nong thuoc xa hoi va phat va".
• Adding a wildcard symbol may retrieve word variants: tu sach ((hoi tai) OR (hoc tap)), nghien huu tung hoc nganh nong thuoc xa hoi va phat va*.