Perhaps you should try some spelling variations:
luc thanh » duc thanh, luu thanh, tuc thanh
mach hoc » cach hoc, dich hoc, anh hoc
cuu long » cuu cong, cuu tong, cuu nang
long luc » dong luc, long cuc, long lich
cong hoc » dong hoc, cong hoa, cong coc
hoi danh » hop danh, hoi dan, hoc danh
van tuan » van quan, van ban
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 long luc thanh cong hoc xa hoi danh ((van tuan) or (anh tuan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu long luc thanh cong hoc xa hoi danh ((van tuan) OR (anh tuan)).
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu long luc thanh cong hoc xa hoi danh ((van tuan) or (anh tuan))*.