Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam tu
vat hanh » vat thanh, van hanh, va hanh
cau tren » cu tren, dau tren, ca tren
thu sac » thu sach, thu san, thu xac
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang co hoi. hieu ve ((nam thuc) OR (nam thu)) vat hanh vi cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang co hoi. hieu ve ((nam thuc) OR (nam thu)) vat hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang co hoi. hieu ve ((nam thuc) OR (nam thu)) vat hanh vi cau tren*.