Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
hoc nganh » hoc nhanh
kon mach » ke mach
ban mach » ban sach, ranh mach, ban hanh
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
thuoc va » thuc va, thuoc ma, thuong va
cua nhan » ca nhan, cua ngan, cua nha
nhan van » nhan dan, nhan va, phan van
hoi cua » hoi chuc
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: ((kon mach) OR (ban mach)) hoc tap, nghien cuu cong hoc nganh khong thuoc va hoi cua nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((kon mach) OR (ban mach)) hoc tap, nghien cuu cong hoc nganh khong thuoc va hoi cua nhan van".
• Adding a wildcard symbol may retrieve word variants: ((kon mach) OR (ban mach)) hoc tap, nghien cuu cong hoc nganh khong thuoc va hoi cua nhan van*.