Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
dinh vai » dinh van, dinh vi, dinh va
su triet » su viet, ve triet
hien cac » thien cac, vien cac, hieu cac
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
va dinh » van dinh, va kinh, va tinh
sach ty » sach y, sach tu, sach thu
cac lao » ca lao, cac loai, cac giao
ty nang » ky nang, ty xang, ty hang
su tien » su kien, su hien, tu tieng
lao va » tao va, cao va, bao va

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 nang x ho. bieu hien cac lao va dinh vai ((cua tre) or (((su triet) OR (su tien))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x ho. bieu hien cac lao va dinh vai ((cua tre) OR (((su triet) OR (su tien)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x ho. bieu hien cac lao va dinh vai ((cua tre) or (((su triet) OR (su tien))))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x ho. bieu hien cac lao va dinh vai ((cua tre) or (((su triet) OR (su tien))))*.