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