Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
dau cua » day cua, cau cua, dan cua
hieu su » hieu sau, tieu su, hieu so
nang co » nang cao, nang doc, nang noi
hieu vu » hieu va, hieu ve, dieu vu
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
co hoi » co hoc, co loi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang co hoi. ((hieu vu) OR (hieu su)) cham tuc va dan ((dau cua) OR (dai cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang co hoi. ((hieu vu) OR (hieu su)) cham tuc va dan ((dau cua) or (dai cua)) te~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang co hoi. ((hieu vu) OR (hieu su)) cham tuc va dan ((dau cua) or (dai cua)) te*.