Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
cac loc » cac lop, cac toc, cac hoc
dinh di » dinh du, danh di, dinh da
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet
loc va » hoc va, luc va

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) or (thu sach)) ky tang ma hoa. lieu va cac loc va ((dinh di) OR (dinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky tang ma hoa. lieu va cac loc va ((dinh di) OR (dinh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) ky tang ma hoa. lieu va cac loc va ((dinh di) OR (dinh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky tang ma hoa. lieu va cac loc va ((dinh di) OR (dinh vi)) cua tre*.