Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
va thanh » gia thanh, ban thanh, va tinh
vien cua » viec cua, dien cua, tien cua
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
cao hoi » co hoi, cao hoc, tao hoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
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 ly nang ((cao hoi) or (cau hoi)). ((hieu ve) OR (hieu va)) pham duc va thanh vien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((cao hoi) OR (cau hoi)). ((hieu ve) OR (hieu va)) pham duc va thanh vien cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ((cao hoi) or (cau hoi)). ((hieu ve) OR (hieu va)) pham duc va thanh vien cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((cao hoi) or (cau hoi)). ((hieu ve) OR (hieu va)) pham duc va thanh vien cua tre*.