Perhaps you should try some spelling variations:
sach tham » sach nha
tan thanh » tran thanh, tang thanh, toan thanh
thanh tri » thanh tra, thanh tai, chinh tri
cua triet » cua viet, su triet, va triet
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac

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