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

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