Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
mach hoc » dich hoc, anh hoc, bac hoc
cach hoc » cach thuc, cach thoi, dich hoc
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va luan » vay luan, van luan, va quan
tim » time

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tim ((mach hoc) OR (cach hoc)) tap, nghien cac cong hoc nganh khoa hoc mai hoi va luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tim ((mach hoc) OR (cach hoc)) tap, nghien cac cong hoc nganh khoa hoc mai hoi va luan van".
• Adding a wildcard symbol may retrieve word variants: tim ((mach hoc) OR (cach hoc)) tap, nghien cac cong hoc nganh khoa hoc mai hoi va luan van*.