Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
hieu vien » hieu hien, hieu viec, thieu nien
cac thuc » cac thu, can thuc, cay thuc
cao hoi » cau hoi, co hoi, cao hoc
va danh » va dinh, va dan, va hanh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
co cua » con cua, cong cua, cuoi cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang cao hoi. hieu vien ((cac thuc) OR (cach thuc)) va danh ((co cua) or (ca cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang cao hoi. hieu vien ((cac thuc) OR (cach thuc)) va danh ((co cua) OR (ca cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang cao hoi. hieu vien ((cac thuc) OR (cach thuc)) va danh ((co cua) or (ca cua)) tu".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang cao hoi. hieu vien ((cac thuc) OR (cach thuc)) va danh ((co cua) or (ca cua)) tu*.