Perhaps you should try some spelling variations:
sieu viet » su viet, dien viet, bien viet
trinh van » trinh han, trinh quan, trinh toan
hieu viec » nhieu viec, hieu ve, hieu hien
va trinh » van trinh, va tinh, lap trinh
tu sach » thu sach, su sach, te sach
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty hang, ly nang
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 ((ty nang) OR (ty xang)) xa hoi. ((hieu viec) or (sieu viet)) cam xuc va trinh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) xa hoi. ((hieu viec) OR (sieu viet)) cam xuc va trinh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty xang)) xa hoi. ((hieu viec) or (sieu viet)) cam xuc va trinh van cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty xang)) xa hoi. ((hieu viec) or (sieu viet)) cam xuc va trinh van cua tre*.