Perhaps you should try some spelling variations:
tang tai » hang tai, dung tai, sang tao
vat tang » van tang, vat mang, vat trong
cam thuc » am thuc, nam thuc, cam thu
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
hieu va » lieu va, hieu qua
ty hang » ty xang, thi hang, thu hang
ly hang » ly quang
va cam » va cham, va cac, va cao
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 ((ty hang) or (ly hang)) x hoi. hieu va cam thuc vat tang tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty hang) OR (ly hang)) x hoi. hieu va cam thuc vat tang tai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty hang) or (ly hang)) x hoi. hieu va cam thuc vat tang tai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty hang) or (ly hang)) x hoi. hieu va cam thuc vat tang tai ((cua tre) OR (cua te))*.