Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
vien cac » vien bach, vien dai, vien da
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, dua tren
va hanh » van hanh, va thanh, ban hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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 ky dang xay hoi. hieu vien cac xuc ((va danh) OR (va hanh)) ca ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. hieu vien cac xuc ((va danh) OR (va hanh)) ca ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xay hoi. hieu vien cac xuc ((va danh) OR (va hanh)) ca ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. hieu vien cac xuc ((va danh) OR (va hanh)) ca ((cua tre) or (cua triet))*.