Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
hanh van » thanh van, khanh van, hanh va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
duc ban » duc tan, duc van, dua ban
van cua » vang cua, ban cua, dan cua

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 ty nang xa hoi. hieu ((van lam) or (van nam)) duc ban hanh van cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ((van lam) OR (van nam)) duc ban hanh van cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu ((van lam) or (van nam)) duc ban hanh van cua triet*.