Perhaps you should try some spelling variations:
benh vien » sinh vien
vien cua » viec cua, dien cua, tien cua
ban benh » san benh, ba benh, ban banh
quoc ban » quoc bao, quoc lan, quoc quan
tu sach » thu sach, su sach, tu cach
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
va cao » va co, va dao, va bao

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) or (te sach)) y nang ma hoi. lieu ((va cao) OR (va cac)) quoc ban benh vien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang ma hoi. lieu ((va cao) OR (va cac)) quoc ban benh vien cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang ma hoi. lieu ((va cao) OR (va cac)) quoc ban benh vien cua tre*".