Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
nam thuc » nam thuoc, am thuc, nam thu
ve triet » su triet
tay lang » tai lang, tay tang, tay quang
thuc van » thuc vat, thuc dan, thuc va
van anh » van thanh, tuan anh, van minh
so sach » so sanh, bo sach, co sach
hiem he » hiem xe, hieu he, thien he
y lang » o lang, _ lang, yen lang
ha hoi » hoa hoi, ha noi, xa hoi
anh di » danh di, xanh di, anh d
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((y lang) or (tay lang)) ha hoi. hiem he nam thuc van anh di ((ve triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y lang) OR (tay lang)) ha hoi. hiem he nam thuc van anh di ((ve triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y lang) or (tay lang)) ha hoi. hiem he nam thuc van anh di ((ve triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: so sach ((y lang) or (tay lang)) ha hoi. hiem he nam thuc van anh di ((ve triet) OR (va trien))*.