Perhaps you should try some spelling variations:
thanh duong » thanh huong, thanh cuong, thanh vuong
thanh dong » thanh cong, hanh dong, nhanh dong
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
hoi danh » hop danh, hoi dan, hoc danh
danh von » danh ngon, doanh van, danh vinh
tu mach » tu cach, tu manh, tu hach
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: tu mach hoc tap, nghien cuu dong luc ((thanh dong) OR (thanh duong)) hoc xa hoi danh von tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu dong luc ((thanh dong) OR (thanh duong)) hoc xa hoi danh von tai".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu dong luc ((thanh dong) OR (thanh duong)) hoc xa hoi danh von tai*.