Perhaps you should try some spelling variations:
van chat » cao chat
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » nang x, lang xa, nang ma
ve chat » va chat
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach 2, sach vay

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 v) or (sach y)) nang xa hoi. hieu ((ve chat) OR (van chat)) duc van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach y)) nang xa hoi. hieu ((ve chat) OR (van chat)) duc van hanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang xa hoi. hieu ((ve chat) OR (van chat)) duc van hanh dai cua tre*".