Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
van nhan » van phan, van thanh, danh nhan
bo mach » bo sach, ban mach, bo trach
xua hai » qua hai, cua hai, xa hai
hai van » thai van, ha van, hai tan
nhan va » nhan tai, nhan dan, nhan tao

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

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