Perhaps you should try some spelling variations:
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cau cua » cau qua, ca cua, cu cua
cac chu » cac thu, cac che, cac khu
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cau cuu » cap cuu, cau chu, cham cuu
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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: te sach ky lang xa hoi. hieu van ((((cau cuu) OR (cau cua))) or (cac chu)) ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu van ((((cau cuu) OR (cau cua))) OR (cac chu)) ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu van ((((cau cuu) OR (cau cua))) or (cac chu)) ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu van ((((cau cuu) OR (cau cua))) or (cac chu)) ban hanh vi cua tre*.