Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
doc sach » hoc sach, toc sach, nuoc sach
va tham » van tham, va thanh, va thuat
sach ky » sac ky, sach y, sach ty
va cham » va chat
lang xa » lang ha, dang xay, lang van
xuc van » duc van, luc van, xuc ban
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky lang xa hoi. hieu ((va tham) or (va cham)) xuc van hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky lang xa hoi. hieu ((va tham) OR (va cham)) xuc van hanh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: doc sach ky lang xa hoi. hieu ((va tham) or (va cham)) xuc van hanh vi ((cua tre) or (cua triet))*.