Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
van tham » van thanh, van tuan, van chat
tham duc » pham duc, tham du, than duc
sach ty » sach tu, sach thu, xach tay
duc ban » duc tan, duc van, dua ban
x hoi » xa hoi, o hoi, x ho

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) or (sach y)) nang x hoi. hieu van tham duc ban ((hanh lai) OR (hanh tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang x hoi. hieu van tham duc ban ((hanh lai) OR (hanh tai)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) nang x hoi. hieu van tham duc ban ((hanh lai) OR (hanh tai)) cua triet*".