Perhaps you should try some spelling variations:
thi lang » thi nang, thi lan, thi hang
van hanh » van thanh, ban hanh, van anh
sach thi » sach thu, sach tai, sach thieu
te sach » toc sach
doi cua » dai cua, hoi cua
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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 thi lang xa hoi. hieu ((ve cam) or (ve cac)) duc ((va hanh) OR (van hanh)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi lang xa hoi. hieu ((ve cam) OR (ve cac)) duc ((va hanh) OR (van hanh)) doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi lang xa hoi. hieu ((ve cam) or (ve cac)) duc ((va hanh) OR (van hanh)) doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach thi lang xa hoi. hieu ((ve cam) or (ve cac)) duc ((va hanh) OR (van hanh)) doi cua tre*.