Perhaps you should try some spelling variations:
tu triet » su triet, tu thiet, tu trien
thuc dan » thuc hanh, hoc dan, thuc vat
danh de » hanh de, dan de, dang de
te sach » toc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc day
te sac » te cac, te san
de tu » do tu
ve am » va am

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

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