Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
tuc van » thuc van, truc van, tuc va
cuu tre » cua tre, cau tren, cau treo
hoa hoi » khoa hoi, hoa hoc, hoa doi
sach 7 » sach y, sach 2
ve cac » va cac, vien cac
7 lang » o lang, _ lang
vi cuu » vi luu, vinh cuu
ve cai » va cai, ve tai, ve cau

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 lang ((ha noi) or (hoa hoi)). hieu ((ve cai) or (ve cac)) tuc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 7 lang ((ha noi) OR (hoa hoi)). hieu ((ve cai) OR (ve cac)) tuc van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach 7 lang ((ha noi) or (hoa hoi)). hieu ((ve cai) or (ve cac)) tuc van hanh vi cuu tre*.