Perhaps you should try some spelling variations:
yen lang » den lang, ten lang, yen giang
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hieu ve » hieu va, hieu van
y lang » _ lang, tay lang
o lang » hoa lang, hoi lang
ve nam » he nam, va nam, le nam
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 (yen lang))) or (o lang)) xa hoi. hieu ve nam thuc van hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((((y lang) OR (yen lang))) OR (o lang)) xa hoi. hieu ve nam thuc van hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((((y lang) OR (yen lang))) or (o lang)) xa hoi. hieu ve nam thuc van hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach ((((y lang) OR (yen lang))) or (o lang)) xa hoi. hieu ve nam thuc van hanh vi cua tu*.