Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
thi van » thi lan, thi hanh, thi nang
van cam » van nam, van lam, van cau
duc vao » dua vao, duc dao, duc van
benh ve » benh va, benh vien, benh viem
cua tre » cuu tre, cua triet, dua tren
y hang » ly hang, ty hang, yu hang
hang x » nang x, hoang xa, chang xu
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y hang x hoi. thi van cam ((duc va) or (duc vao)) benh ve ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y hang x hoi. thi van cam ((duc va) OR (duc vao)) benh ve ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y hang x hoi. thi van cam ((duc va) or (duc vao)) benh ve ((cua tre) OR (cua te))*".