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