Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
cac thuc » cach thuc, cac thu, can thuc
thanh va » thanh van, hanh va, thanh ha
su triet » su viet, su tien
ve triet » va trien
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky ((nang xa) OR (nang ma)) hoi. lieu va cac thuc vat thanh va ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky ((nang xa) OR (nang ma)) hoi. lieu va cac thuc vat thanh va ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky ((nang xa) OR (nang ma)) hoi. lieu va cac thuc vat thanh va ((su triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: bo sach ky ((nang xa) OR (nang ma)) hoi. lieu va cac thuc vat thanh va ((su triet) or (ve triet))*.