Perhaps you should try some spelling variations:
thuc dan » hoc dan, thuc vat
than tai » thanh tai, toan tai, nhan tai
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
han tai » hang tai, nhan tai, van tai
san ky » sang ky, van ky, dan ky
cua te » cua tu
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc san ky tang xa hoi. hieu va nam ((thuc dan) OR (thuc hanh)) ((han tai) or (than tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc san ky tang xa hoi. hieu va nam ((thuc dan) OR (thuc hanh)) ((han tai) OR (than tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc san ky tang xa hoi. hieu va nam ((thuc dan) OR (thuc hanh)) ((han tai) or (than tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: toc san ky tang xa hoi. hieu va nam ((thuc dan) OR (thuc hanh)) ((han tai) or (than tai)) cua te*.