Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
thanh hai » thanh hoa, thanh san
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
du hanh » dieu hanh, duy khanh, luu hanh
ve cam » ve cham, ve cac, va cam

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