Perhaps you should try some spelling variations:
danh sai » dung sai, danh bat, danh dau
dinh lam » dinh van, tinh lao
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
tu cong » thu cong, te cong, tai cong
tu nong » tu dong, tu tong, tu tuong
va cam » va cham, va cac, va cao

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 ((tu nong) OR (tu cong)) xa hoi. hieu va cam duc va ((dinh lam) or (danh sai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nong) OR (tu cong)) xa hoi. hieu va cam duc va ((dinh lam) OR (danh sai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nong) OR (tu cong)) xa hoi. hieu va cam duc va ((dinh lam) or (danh sai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nong) OR (tu cong)) xa hoi. hieu va cam duc va ((dinh lam) or (danh sai)) cua tre*.