Perhaps you should try some spelling variations:
sach tham » sach nha
tan nhanh » tai nhanh, tan nhan, tan thanh
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
thi cua » thai cua, thi cuc, thi dua

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