Perhaps you should try some spelling variations:
thuc van » thuc dan, thuc va, thuc hanh
te sach » toc sach
hieu le » hieu ve, hieu he, hieu ly
y lang » _ lang, tay lang, yen lang
o lang » hoa lang, hoi lang
le nam » ly nam, he nam, le na
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 (o lang)) xa hoi. hieu le nam ((thuc van) or (thuc vat)) hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y lang) OR (o lang)) xa hoi. hieu le nam ((thuc van) OR (thuc vat)) hanh vi cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y lang) OR (o lang)) xa hoi. hieu le nam ((thuc van) or (thuc vat)) hanh vi cua tu*".