Perhaps you should try some spelling variations:
nhanh hoan » thanh hoang, thanh hoa, khanh hoa
nhanh hoa » thanh hoa, khanh hoa, nhanh ha
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
dap toan » tap toan, dan toan, dap tan
toan tai » toan tap, doanh tai, toan ban
vu mach » vi mach, vu bach, vu manh
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu mach hoc tap, nghien cuu dong hoc ((nhanh hoa) or (nhanh hoan)) hoc xa hoi dap toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu mach hoc tap, nghien cuu dong hoc ((nhanh hoa) OR (nhanh hoan)) hoc xa hoi dap toan tai.
• Adding a wildcard symbol may retrieve word variants: vu mach hoc tap, nghien cuu dong hoc ((nhanh hoa) or (nhanh hoan)) hoc xa hoi dap toan tai*.