Perhaps you should try some spelling variations:
ngay truoc » ngay tuoi, nam truoc
truoc xay » thuc xay, truoc dam, truoc nam
cua triet » su triet, va triet
xay hanh » day nhanh, day thanh, xanh hanh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
va ngay » va nay, tan ngay
ha hoi » hoa hoi, ha noi, va hoi

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 ky tang ((ha hoi) or (xa hoi)). lieu va ngay truoc xay hanh vi ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ((ha hoi) OR (xa hoi)). lieu va ngay truoc xay hanh vi ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang ((ha hoi) or (xa hoi)). lieu va ngay truoc xay hanh vi ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ((ha hoi) or (xa hoi)). lieu va ngay truoc xay hanh vi ((cua triet) OR (cua viet))*.