Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec bach » vien bach, viec ban, viec bao
mai khoa » tai khoa, may khoa, dai khoa
hanh vai » hanh va, hanh tai, hanh van
bach xuc » bach tuoc, bach xuan, bach hue
cua viet » ca viet, hoa viet, cua vat
nang mai » nang ma, nang tai, lang mai
tu nang » tru nang, tu nong, tu nano
te sach » toc sach
tu sach » thu sach, su sach, tu cach
xuc va » duc va, tuc va, luc 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) or (te sach)) tu nang mai khoa. hieu viec bach xuc va ((hanh vai) OR (hanh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) tu nang mai khoa. hieu viec bach xuc va ((hanh vai) OR (hanh vi)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) tu nang mai khoa. hieu viec bach xuc va ((hanh vai) OR (hanh vi)) cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) tu nang mai khoa. hieu viec bach xuc va ((hanh vai) OR (hanh vi)) cua viet*.