Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
cac bo » bac bo, cac co
bo ban » co ban, lo ban, do ban

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

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