Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, cuoc cach, cuon sach
kho tang » cao tang
tang tai » hang tai, dung tai, sang tao
su triet » su viet, su tien, ve triet
hoc sach » hoc sinh, hoc cac, hoc anh
tai hai » thi hai, dai hai, tai ha
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
loc va » hoc va
luc va » duc va, tuc va
ve cac » va cac, vien cac
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nuoc sach) OR (hoc sach)) kho tang tai hai. hieu ve cac ((loc va) or (luc va)) hanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nuoc sach) OR (hoc sach)) kho tang tai hai. hieu ve cac ((loc va) OR (luc va)) hanh di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nuoc sach) OR (hoc sach)) kho tang tai hai. hieu ve cac ((loc va) or (luc va)) hanh di su triet".
• Adding a wildcard symbol may retrieve word variants: ((nuoc sach) OR (hoc sach)) kho tang tai hai. hieu ve cac ((loc va) or (luc va)) hanh di su triet*.