Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai

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