Perhaps you should try some spelling variations:
nganh long » nganh cong, nganh nong, nganh khong
long thuoc » luong thuoc, dong thuoc, khong thuoc
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
thuoc va » thuc va, thuoc ma, thuong va
tu mach » tu cach, tu manh, tu hach
phap va » phap vat, pham va, phap day
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 long thuoc va hoi va ((phap va) or (pham van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu tong hoc nganh long thuoc va hoi va ((phap va) OR (pham van)).
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu tong hoc nganh long thuoc va hoi va ((phap va) or (pham van))*.