Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van pham » san pham, van phan, van phat
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
va pham » va phat, va phap, va phan
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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 y ((nang xa) or (lang xa)) hoi. hieu ((va pham) OR (van pham)) duc va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang xa)) hoi. hieu ((va pham) OR (van pham)) duc va thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (lang xa)) hoi. hieu ((va pham) OR (van pham)) duc va thanh vai cua tre*".