Perhaps you should try some spelling variations:
than tai » thanh tai, toan tai, nhan tai
thuc dan » thuc hanh, hoc dan, thuc vat
nay thuc » nam thuc, cay thuc, day thuc
hieu va » lieu va, hieu qua
sang ky » sang kyo, dang ky, tang ky
han tai » hang tai, nhan tai, van tai
dan ky » van ky
va nay » va ngay, va cay
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: toc ((sang ky) or (dan ky)) nang x hoi. hieu va nay thuc dan ((han tai) or (than tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sang ky) OR (dan ky)) nang x hoi. hieu va nay thuc dan ((han tai) OR (than tai)) cua te.
• Adding a wildcard symbol may retrieve word variants: toc ((sang ky) or (dan ky)) nang x hoi. hieu va nay thuc dan ((han tai) or (than tai)) cua te*.