Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
mach hoi » sach hoi, mach hoc, cach thoi
dac ban » dac san, duc ban, da ban
hoi cua » hoi chuc
cac ban » cac dan, cac van, can ban
su sach » vu sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky nang xa hoi. hieu ve cac ((dac ban) or (cac ban)) mach hoi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang xa hoi. hieu ve cac ((dac ban) OR (cac ban)) mach hoi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang xa hoi. hieu ve cac ((dac ban) or (cac ban)) mach hoi cua triet*.