Perhaps you should try some spelling variations:
danh viet » anh viet, ninh viet, nang viet
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
viet ca » viet ha, viet co, viet a
ca theo » cau theo, va theo, chan theo
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, ve cac

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky ((nang xa) OR (nang ma)) hoi. hieu ve cau tao va danh viet ca theo~".
• Adding a wildcard symbol may retrieve word variants: toc sac ky ((nang xa) OR (nang ma)) hoi. hieu ve cau tao va danh viet ca theo*.