Perhaps you should try some spelling variations:
hanh van » thanh van, khanh van, hanh va
su triet » su tien, ve triet
doc sach » hoc sach, toc sach, nuoc sach
ve pham » vi pham, v pham, ve phat
ve phan » va phan, ke phan, ve phat
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cao hoi » cau hoi, co hoi, cao hoc
su viet » so viet

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 cao hoi. hieu ((ve pham) OR (ve phan)) thuc va hanh van ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang cao hoi. hieu ((ve pham) OR (ve phan)) thuc va hanh van ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang cao hoi. hieu ((ve pham) OR (ve phan)) thuc va hanh van ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang cao hoi. hieu ((ve pham) OR (ve phan)) thuc va hanh van ((su triet) or (su viet))*.