Perhaps you should try some spelling variations:
tay lang » tai lang, tay tang, tay quang
vanh dai » van dai, vanh tai, lanh dao
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va vanh » va van, va danh, va hanh
cua tre » cuu tre, cua triet, dua tren
y lang » o lang, _ lang, yen lang
cua te » cua tu
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y lang) OR (tay lang)) xa hoi. hieu va am thuc va vanh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (tay lang)) xa hoi. hieu va am thuc va vanh dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) OR (tay lang)) xa hoi. hieu va am thuc va vanh dai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) OR (tay lang)) xa hoi. hieu va am thuc va vanh dai ((cua tre) or (cua te))*.