Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thuc dan » thuc hanh, hoc dan, thuc vat
hanh dai » hanh tai, hanh dao, vanh dai
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc day
tu sach » thu sach, su sach, te sach
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh
dai su » dai sua, dai so, dan su

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 ty ang xa hoi. ((hieu ve) or (hieu qua)) cau ((thuc va) or (thuc dan)) hanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ang xa hoi. ((hieu ve) OR (hieu qua)) cau ((thuc va) OR (thuc dan)) hanh dai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ang xa hoi. ((hieu ve) or (hieu qua)) cau ((thuc va) or (thuc dan)) hanh dai su triet*.