Perhaps you should try some spelling variations:
dong thuoc » dung thuoc, don thuoc, dong thuc
dang thuoc » dung thuoc
hoc nganh » hoc nhanh
tung hoc » trung hoc, tuong hoc, dung hoc
te bach » te sach, thi bach
mai tap » bai tap, mai tat, mai tan
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 bach mai tap, nhiem huu tung hoc nganh ((dong thuoc) or (dang thuoc)) va hoi va phap va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te bach mai tap, nhiem huu tung hoc nganh ((dong thuoc) OR (dang thuoc)) va hoi va phap va.
• Adding a wildcard symbol may retrieve word variants: te bach mai tap, nhiem huu tung hoc nganh ((dong thuoc) or (dang thuoc)) va hoi va phap va*.