Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
cua triet » cua viet, su triet, va triet
cac thuc » cach thuc, cac thu, can thuc
thuc gia » thuc giai, thue gia, thuc dia
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
nang ma » sang ma, nang cao, mang may
cua tre » cua te, cuu tre, dua tren
so sach » so sanh, bo sach, co sach
sach v » sach va, sach y, sach 2

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v ((nang ma) OR (tang ma)) hoi. hieu va cac thuc gia thanh vien ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v ((nang ma) OR (tang ma)) hoi. hieu va cac thuc gia thanh vien ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v ((nang ma) OR (tang ma)) hoi. hieu va cac thuc gia thanh vien ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: so sach v ((nang ma) OR (tang ma)) hoi. hieu va cac thuc gia thanh vien ((cua tre) or (cua triet))*.