Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
va thanh » gia thanh, va tinh, le thanh
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
lai cua » dai cua, hai cua, lai chau
nang o » nang ho, nang ro, nang x

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky ((nang o) OR (nang co)) hoi. hieu ve pham duc ((va thanh) or (ban thanh)) lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky ((nang o) OR (nang co)) hoi. hieu ve pham duc ((va thanh) OR (ban thanh)) lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky ((nang o) OR (nang co)) hoi. hieu ve pham duc ((va thanh) or (ban thanh)) lai cua triet".
• Adding a wildcard symbol may retrieve word variants: doc sach ky ((nang o) OR (nang co)) hoi. hieu ve pham duc ((va thanh) or (ban thanh)) lai cua triet*.