Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lai » hanh lam, thanh lap, thanh loi
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
xang o » lang o, tang o, dang o
ve cac » va cac, vien cac
cac bo » bac bo, cac co
bo van » vo van, so van, do van
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty xang o hoi. hieu ve cac bo van ((hanh lai) or (hanh tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang o hoi. hieu ve cac bo van ((hanh lai) OR (hanh tai)) cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang o hoi. hieu ve cac bo van ((hanh lai) or (hanh tai)) cua triet*.