Perhaps you should try some spelling variations:
thien van » thi van
thanh vai » thanh hai, thanh van, thanh tai
van lam » van nam
vai cua » dai cua, hai cua, lai cua
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
sang ma » nang ma, sang tao, mang may
tang ma » mang may, tang van
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 ky ((tang ma) or (sang ma)) hoi. thien van lam ((duc ban) or (duc van)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((tang ma) OR (sang ma)) hoi. thien van lam ((duc ban) OR (duc van)) thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((tang ma) or (sang ma)) hoi. thien van lam ((duc ban) or (duc van)) thanh vai cua tre*.