Perhaps you should try some spelling variations:
khanh hoa » thanh hoa, hang hoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
danh hoa » thanh hoa, nganh hoa, danh cho
nhan tai » hang tai, van tai, toan tai
tu mach » tu cach, tu manh, tu hach
cu nhan » ca nhan
hoc xa » hoc ma
hoi cu » hoi chu, hoi cua, 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: tu mach hoc tap, nghien cuu dong hoc ((danh hoa) OR (khanh hoa)) hoc xa hoi cu nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu dong hoc ((danh hoa) OR (khanh hoa)) hoc xa hoi cu nhan tai".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu dong hoc ((danh hoa) OR (khanh hoa)) hoc xa hoi cu nhan tai*.