Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
lang van » dang van, hoang van, giang van
tang van » dang van, hoang van, trong van
van tham » van thanh, van tuan, van chat
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
va tham » va cham, va thanh, va thuat
soc van » hoc van, oc van, sac van
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((lang van) OR (tang van)) hoi. lieu ((va tham) or (van tham)) soc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang van) OR (tang van)) hoi. lieu ((va tham) OR (van tham)) soc van hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((lang van) OR (tang van)) hoi. lieu ((va tham) or (van tham)) soc van hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang van) OR (tang van)) hoi. lieu ((va tham) or (van tham)) soc van hanh vi cuu tre*.