Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dang xay » dang van, van xay
van tham » van thanh, van tuan, van chat
lang xa » lang ha, lang van
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
te sach » toc sach
soc va » hoc va, loc va, doc va
vi cau » va cau, ve cau, di cau

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) OR (dang xay)) hoi. hieu ((van tham) or (va cham)) soc va hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (dang xay)) hoi. hieu ((van tham) OR (va cham)) soc va hanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) OR (dang xay)) hoi. hieu ((van tham) or (va cham)) soc va hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) OR (dang xay)) hoi. hieu ((van tham) or (va cham)) soc va hanh vi cau tren*.