Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hanh di » hanh vi, hanh de, hang di
hieu va » lieu va, hieu qua
te sach » toc sach
ho nang » thi nang, kha nang, cao nang
lo nang » ly nang, loai nang, cao nang
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((lo nang) OR (ho nang)) ma hoi. ((hieu van) or (hieu va)) nam thuc van hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((lo nang) OR (ho nang)) ma hoi. ((hieu van) OR (hieu va)) nam thuc van hanh di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((lo nang) OR (ho nang)) ma hoi. ((hieu van) or (hieu va)) nam thuc van hanh di cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach ((lo nang) OR (ho nang)) ma hoi. ((hieu van) or (hieu va)) nam thuc van hanh di cua vat*.