Perhaps you should try some spelling variations:
thanh doi » thanh moi, thanh do, thanh hoai
thanh loi » thanh hoa, thanh hai, thanh lap
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
thuc dan » thuc hanh, hoc dan, thuc vat
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
y lang » o lang, _ lang, tay lang
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: so sach y lang xa hoi. hieu van cam thuc dan ((thanh doi) OR (thanh loi)) cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y lang xa hoi. hieu van cam thuc dan ((thanh doi) OR (thanh loi)) cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach y lang xa hoi. hieu van cam thuc dan ((thanh doi) OR (thanh loi)) cua tu*.