Perhaps you should try some spelling variations:
khanh hoan » nhanh hoan, khanh toan, thanh hoang
khanh hoa » thanh hoa, hang hoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu long » cuu cong, cuu tong, cuu nang
long hoc » dong hoc, long soc, long thuoc
dap toan » tap toan, dan toan, dap tan
toan tai » toan tap, doanh tai, toan ban
vi mach » tim mach
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: vi mach hoc tap, nghien cuu long hoc ((khanh hoa) or (khanh hoan)) hoc xa hoi dap toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vi mach hoc tap, nghien cuu long hoc ((khanh hoa) OR (khanh hoan)) hoc xa hoi dap toan tai.
• Adding a wildcard symbol may retrieve word variants: vi mach hoc tap, nghien cuu long hoc ((khanh hoa) or (khanh hoan)) hoc xa hoi dap toan tai*.