Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu phan » phieu phan, lieu phan, hieu pham
phan dau » phan tu, hang dau
hanh dai » hanh tai, hanh dao, vanh dai
dang van » hoang van, hang va
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
dau duc » dao duc, dang duc, dau nuoc
tu sach » thu sach, su sach, te sach
ky dang » ky nang, ky danh
cuu 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: ((tu sach) or (thuoc sach)) ky dang van hoa. hieu phan dau duc va hanh dai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky dang van hoa. hieu phan dau duc va hanh dai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky dang van hoa. hieu phan dau duc va hanh dai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky dang van hoa. hieu phan dau duc va hanh dai ((cua tre) OR (cuu tre))*.