Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
tu sach » thu sach, su sach, te sach
van anh » van thanh, tuan anh, van minh
cuu tre » cua tre, cau tren, cau treo
tang xa » trang xa, tang ma, lang xa
sach 7 » sach y, sach 2
ve cam » ve cham, va cam, ve cai
7 tang » 6 tang
vi cuu » vi luu, vinh cuu
ve cac » va cac, vien cac

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 7 tang xa hoi. hieu ((ve cam) or (ve cac)) tuc ((van hanh) OR (van anh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 7 tang xa hoi. hieu ((ve cam) OR (ve cac)) tuc ((van hanh) OR (van anh)) vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach 7 tang xa hoi. hieu ((ve cam) or (ve cac)) tuc ((van hanh) OR (van anh)) vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach 7 tang xa hoi. hieu ((ve cam) or (ve cac)) tuc ((van hanh) OR (van anh)) vi cuu tre*.