Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
van chat » cao chat
su sach » vu sach
huu van » cuu van, huu han, luu van
va chat » va phat, cao chat, hoa chat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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) OR (so sach)) ky lang xa hoi. hieu ((va chat) or (van chat)) huu van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky lang xa hoi. hieu ((va chat) OR (van chat)) huu van hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky lang xa hoi. hieu ((va chat) or (van chat)) huu van hanh vi cua tre*".