Perhaps you should try some spelling variations:
sieu viet » su viet, dien viet, bien viet
hieu viec » nhieu viec, hieu ve, hieu hien
trinh vi » trinh va, trinh ve, trinh viet
thu sach » thuat sach, thuoc sach, thu hoach
va trinh » van trinh, va tinh, lap trinh
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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 (thu sach)) ty nang xa hoi. ((hieu viec) or (sieu viet)) cam xuc va trinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang xa hoi. ((hieu viec) OR (sieu viet)) cam xuc va trinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang xa hoi. ((hieu viec) or (sieu viet)) cam xuc va trinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang xa hoi. ((hieu viec) or (sieu viet)) cam xuc va trinh vi cua tre*.