Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cap » van cau, van ca, van chat
van dap » van dao, va dap, van dau
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (tu sach)) ky nang xa hoi. thien ((van cap) OR (van dap)) cuu van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (tu sach)) ky nang xa hoi. thien ((van cap) OR (van dap)) cuu van hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (tu sach)) ky nang xa hoi. thien ((van cap) OR (van dap)) cuu van hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (tu sach)) ky nang xa hoi. thien ((van cap) OR (van dap)) cuu van hanh de cua tre*.