Perhaps you should try some spelling variations:
dong thuoc » dung thuoc, dang thuoc, dong thuc
hoc nganh » hoc nhanh
don thuoc » dung thuoc, dang thuoc, doan phuoc
mach hoc » cach hoc, dich hoc, anh hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
tu mach » tu cach, tu manh, tu hach
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: tu mach hoc tap, nghien cuu tong hoc nganh ((dong thuoc) OR (don thuoc)) va hoi va phap va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu tong hoc nganh ((dong thuoc) OR (don thuoc)) va hoi va phap va".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu tong hoc nganh ((dong thuoc) OR (don thuoc)) va hoi va phap va*.