Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc hanh
thanh ve » hanh ve, thanh va, thanh vien
te sach » toc sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
ve cua » le cua, de cua, te cua
cua te » cua tu
va am » va lam, va cam

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 ((y lang) or (_ lang)) xa hoi. hieu va am ((thuc van) OR (thuc va)) thanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y lang) OR (_ lang)) xa hoi. hieu va am ((thuc van) OR (thuc va)) thanh ve cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y lang) or (_ lang)) xa hoi. hieu va am ((thuc van) OR (thuc va)) thanh ve cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((y lang) or (_ lang)) xa hoi. hieu va am ((thuc van) OR (thuc va)) thanh ve cua te*.