Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
dua tren » dung tren
viet dua » viet duc, viet duy, viet qua
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky nang x hoi. hieu va cham ((xuc va) OR (luc va)) dinh viet dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang x hoi. hieu va cham ((xuc va) OR (luc va)) dinh viet dua tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky nang x hoi. hieu va cham ((xuc va) OR (luc va)) dinh viet dua tren*".