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
va chat » van chat, va phat, cao chat
va dinh » van dinh, va kinh, va tinh
va cham » va tham
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) OR (va chat)) hoc 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) OR (va chat)) hoc 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) OR (va chat)) hoc va dinh viet dua tren*".