Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
nam xua » nam cua, nam mua, nam luat
nam qua » nam quan, nam cua, nam mua
cua tre » cua te, cuu tre, cua triet
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: tu ((sach ky) or (sach y)) lang xa hoi. lieu va ((nam xua) OR (nam qua)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) lang xa hoi. lieu va ((nam xua) OR (nam qua)) van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) lang xa hoi. lieu va ((nam xua) OR (nam qua)) van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) lang xa hoi. lieu va ((nam xua) OR (nam qua)) van hanh vi cua tre*.