Perhaps you should try some spelling variations:
nang lai » nang tai, nang cai, nang hai
mang lai » mang lam, mang luoi, dang loai
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang lai) or (mang lai)) hoi. hieu ((ve cam) OR (va cam)) duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang lai) OR (mang lai)) hoi. hieu ((ve cam) OR (va cam)) duc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang lai) or (mang lai)) hoi. hieu ((ve cam) OR (va cam)) duc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang lai) or (mang lai)) hoi. hieu ((ve cam) OR (va cam)) duc va hanh vi cua tre*.