Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
cua viet » ca viet, hoa viet, cua vat
tay lang » tai lang, tay tang, tay quang
hanh hai » thanh hai, nhanh hai, hang hai
vat hanh » vat thanh, van hanh, va hanh
te sach » toc sach
su viet » so viet
hieu he » hieu ve, hiem he, hieu le
y lang » o lang, _ lang, yen lang
ha hoi » hoa hoi, ha noi, xa hoi
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: te sach ((y lang) or (tay lang)) ha hoi. hieu he nam thuc vat hanh hai ((cua viet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y lang) OR (tay lang)) ha hoi. hieu he nam thuc vat hanh hai ((cua viet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: te sach ((y lang) or (tay lang)) ha hoi. hieu he nam thuc vat hanh hai ((cua viet) or (su viet))*.