Perhaps you should try some spelling variations:
voi nhat » moi nhat, hoi nhap, do nhat
hanh van » thanh van, khanh van, hanh va
doc sach » hoc sach, toc sach, nuoc sach
vi nham » vi pham, vi tham, kim nham
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 tien » su kien, tu tieng, dau tien
su hien » su kien, thu hien, nhu hien

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