Perhaps you should try some spelling variations:
thien van » thi van
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
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 » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua
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 tu nang x hoi. thien van cam ((duc va) or (duc vao)) benh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang x hoi. thien van cam ((duc va) OR (duc vao)) benh ve cua tre*.