Perhaps you should try some spelling variations:
thieu xang » thieu khang, thieu quang, chieu sang
hieu viec » nhieu viec, hieu ve, sieu viet
hanh vai » hanh vi, hanh tai, hanh van
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
viec da » viec dat, vien da, viec va
mai hoi » mai khoi, dai hoi, lai hoi
ca viet » va viet, co viet, hoa viet
xuc va » duc va, tuc va, luc va
ma hoi » xa hoi, ma hoa, me hoi

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 thieu xang ((ma hoi) OR (mai hoi)). hieu viec da xuc va ((hanh vai) or (hanh va)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thieu xang ((ma hoi) OR (mai hoi)). hieu viec da xuc va ((hanh vai) OR (hanh va)) ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thieu xang ((ma hoi) OR (mai hoi)). hieu viec da xuc va ((hanh vai) or (hanh va)) ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach thieu xang ((ma hoi) OR (mai hoi)). hieu viec da xuc va ((hanh vai) or (hanh va)) ca viet*.