Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
dinh cuu » dinh chi
te sach » toc sach
nam duc » nam duoc, pham duc, nam thuc
dinh cu » dinh chuc, dinh chau, dinh chi
y nang » ky nang, ly nang, v nang
vi cuu » vi luu, vinh cuu

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: te sach y nang x ho. hieu van nam duc va thanh ((vi cuu) OR (((dinh cu) OR (dinh cuu)))) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x ho. hieu van nam duc va thanh ((vi cuu) or (((dinh cu) OR (dinh cuu)))) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x ho. hieu van nam duc va thanh ((vi cuu) or (((dinh cu) OR (dinh cuu)))) tre*.