Perhaps you should try some spelling variations:
dang xay » dang van, van xay
su triet » su tien, ve triet
qua tham » qua cham, qua than, qua thanh
su sach » so sach, vu sach
thuc va » thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
su viet » so viet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu qua tham ((thuc va) OR (thuc vat)) hanh vi ((su triet) OR (su viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xay hoi. hieu qua tham ((thuc va) OR (thuc vat)) hanh vi ((su triet) or (su viet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu qua tham ((thuc va) OR (thuc vat)) hanh vi ((su triet) or (su viet))*.