Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
pham thuc » phap thuc, pham chuc, nham thuc
thuc ban » thuoc ban, thuc dan, thu ban
thanh ve » hanh ve, thanh va, thanh van
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
va pham » van pham, va phat, va phap
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang 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 ty ((mang xa) or (lang xa)) hoi. lieu va pham thuc ban ((thanh ve) OR (thanh vien)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((mang xa) OR (lang xa)) hoi. lieu va pham thuc ban ((thanh ve) OR (thanh vien)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((mang xa) or (lang xa)) hoi. lieu va pham thuc ban ((thanh ve) OR (thanh vien)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((mang xa) or (lang xa)) hoi. lieu va pham thuc ban ((thanh ve) OR (thanh vien)) cua tre*.