Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
thuc van » thuc dan, thuc va, thuc hanh
te sach » toc sach
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
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 ma hoi. ((hieu van) or (hieu va)) nam ((thuc van) OR (thuc vat)) hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach lo nang ma hoi. ((hieu van) OR (hieu va)) nam ((thuc van) OR (thuc vat)) hanh di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach lo nang ma hoi. ((hieu van) or (hieu va)) nam ((thuc van) OR (thuc vat)) hanh di cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach lo nang ma hoi. ((hieu van) or (hieu va)) nam ((thuc van) OR (thuc vat)) hanh di cua vat*.