Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
ky dang » ky danh
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » van hanh, va thanh, va danh
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (te sach)) ((ky dang) OR (ky nang)) xa hoi. hieu ve pham duc va hanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ((ky dang) OR (ky nang)) xa hoi. hieu ve pham duc va hanh dai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ((ky dang) OR (ky nang)) xa hoi. hieu ve pham duc va hanh dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ((ky dang) OR (ky nang)) xa hoi. hieu ve pham duc va hanh dai cuu tre*.