Perhaps you should try some spelling variations:
nhanh chong » thanh cong, khanh phong
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoa nhanh » hoc nhanh, hoa thanh, hoa khanh
mach hoc » cach hoc, dich hoc, anh hoc
cac cong » cua cong
cong hoa » dong hoa, dong hoc, hang hoa
cac gian » cac giai, cac giac, cac giao
gian dan » gian lang
su mach » su sach
duoc xa » duoc ma, duoc va, duoc ha
hoi cac » hoc cac, voi cac, hoa cac
doc xa » hoc xa, do xa, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su mach hoc tap, nghien cac cong hoa nhanh chong ((doc xa) or (duoc xa)) hoi cac gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cac cong hoa nhanh chong ((doc xa) OR (duoc xa)) hoi cac gian dan.
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cac cong hoa nhanh chong ((doc xa) or (duoc xa)) hoi cac gian dan*.