Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
sach v » sach va, sach y, sach 2
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua
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: su sach v ((nang xa) or (nang x)) hoi. hieu ((ve cam) OR (ve cac)) truc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang xa) OR (nang x)) hoi. hieu ((ve cam) OR (ve cac)) truc van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang xa) or (nang x)) hoi. hieu ((ve cam) OR (ve cac)) truc van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang xa) or (nang x)) hoi. hieu ((ve cam) OR (ve cac)) truc van hanh di cua tre*.