Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
tu hanh » du hanh, lu hanh, thi hanh
hieu va » hieu qua
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet

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 ((tu hanh) OR (thuc hanh)) xa hoi. ((hieu va) or (lieu va)) cam duc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tu hanh) OR (thuc hanh)) xa hoi. ((hieu va) OR (lieu va)) cam duc va thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tu hanh) OR (thuc hanh)) xa hoi. ((hieu va) or (lieu va)) cam duc va thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((tu hanh) OR (thuc hanh)) xa hoi. ((hieu va) or (lieu va)) cam duc va thanh dai cua tre*.