Perhaps you should try some spelling variations:
dong thuong » cong thuong, dong thong, dung thuong
nganh dong » nganh cong, nhanh dong, nganh nong
hoc nganh » hoc nhanh
thuong va » truong va, thong va, thuong mai
mach hoc » cach hoc, dich hoc, anh hoc
cuu tong » cuu tinh, huu tung, cuu nang
cuu cong » cua cong, thu cong, cac cong
tu mach » tu cach, tu manh, tu hach
va pham » van pham, va phat, va phap
pham va » pham van, pham ma, pham tai
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) OR (cuu cong)) hoc nganh dong thuong va hoi va pham va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien ((cuu tong) OR (cuu cong)) hoc nganh dong thuong va hoi va pham va".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien ((cuu tong) OR (cuu cong)) hoc nganh dong thuong va hoi va pham va*.