Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va chat » va phat, hoa chat, tao chat
huu van » cuu van, huu han, luu van
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 ky lang xa hoi. hieu ((((va chat) OR (cao 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 ky lang xa hoi. hieu ((((va chat) OR (cao 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 ky lang xa hoi. hieu ((((va chat) OR (cao chat))) or (van chat)) huu van hanh vi cua tre*".