Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
hanh nam » thanh nam, hanh lam, hanh ngay
sach ty » sach y, sach tu, xach tay
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
duc van » duc va, duc manh, duc phan
va cam » va cham, va cac, va cao

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) OR (sach thu)) lang xa hoi. hieu va cam ((duc van) or (duc tan)) hanh nam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) lang xa hoi. hieu va cam ((duc van) OR (duc tan)) hanh nam cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) lang xa hoi. hieu va cam ((duc van) or (duc tan)) hanh nam cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) lang xa hoi. hieu va cam ((duc van) or (duc tan)) hanh nam cua triet*.