Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
xanh cao » xanh ca, xanh cay, doanh cao
cac san » cac dan, cac ban, cac dang
thi cua » thai cua, thi cuc, tri cua
anh thi » anh tho, dinh thi, dang thi
cac van » cac dan
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cao cho » cap cho, cao chat
ky xanh » ky anh, ky danh, ky hanh
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: so sach ky xanh cao cho. hieu ve cac ((cac san) or (cac van)) anh thi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky xanh cao cho. hieu ve cac ((cac san) OR (cac van)) anh thi cua triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky xanh cao cho. hieu ve cac ((cac san) or (cac van)) anh thi cua triet*.