Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
duc manh » suc manh, duc anh, duc minh
tu sach » thu sach, su sach, tu cach
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
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) OR (te sach)) ky lang xa hoi. hieu ve cam duc manh ((hanh vai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky lang xa hoi. hieu ve cam duc manh ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky lang xa hoi. hieu ve cam duc manh ((hanh vai) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky lang xa hoi. hieu ve cam duc manh ((hanh vai) or (hanh vi)) cua tre*.