Perhaps you should try some spelling variations:
hieu van » thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
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: te sac ky nang x ho. ((hieu ve) or (((hieu van) OR (hieu va)))) nam thuc va danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang x ho. ((hieu ve) OR (((hieu van) OR (hieu va)))) nam thuc va danh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang x ho. ((hieu ve) or (((hieu van) OR (hieu va)))) nam thuc va danh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x ho. ((hieu ve) or (((hieu van) OR (hieu va)))) nam thuc va danh vi cau tren*.