Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, hieu hien
sieu viet » su viet, dien viet, bien viet
nang dai » nang dau, nang tai, lang dai
dai khoa » da khoa, tai khoa, dac khoa
bach xuc » bach tuoc, bach xuan, bach hue
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
xuc va » duc va, tuc va, luc va
vi ca » vit ca, li ca, va ca

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 dai khoa. ((hieu viec) or (sieu viet)) bach xuc va hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang dai khoa. ((hieu viec) OR (sieu viet)) bach xuc va hanh vi ca viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang dai khoa. ((hieu viec) or (sieu viet)) bach xuc va hanh vi ca viet*.