Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
dong thuoc » dung thuoc, don thuoc, dong thuc
dang thuoc » dung thuoc
hoc nganh » hoc nhanh
sach hoi » sach doi, sach moi, cach thoi
tung hoc » trung hoc, tuong hoc, dung hoc
te sach » toc sach
hoi tap » hoi dap, hoc tap, hoi tai
va phap » va phat, ban phap
phap va » phap vat, pham va, pham van
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: te sach hoi tap, nghien huu tung hoc nganh ((dong thuoc) OR (dang thuoc)) va hoi va phap va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoi tap, nghien huu tung hoc nganh ((dong thuoc) OR (dang thuoc)) va hoi va phap va".
• Adding a wildcard symbol may retrieve word variants: te sach hoi tap, nghien huu tung hoc nganh ((dong thuoc) OR (dang thuoc)) va hoi va phap va*.