Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
ranh mach » trinh mach, tinh mach, ban mach
hoa nganh » khoi nganh, hoa doanh, hoa thanh
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
thuoc va » thuc va, thuoc ma, thuong va
nhan van » nhan dan, nhan va, phan van
va hoi » xa hoi, va hoc, va hoa
hoi ca » hoi cua, hoi cac, hoi cau

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

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