Perhaps you should try some spelling variations:
vien canh » bien canh, vien nganh, vien thanh
vien can » vien cac, vien cao, vien van
tu sach » thu sach, su sach, te sach
va tinh » may tinh
chuc va » thuc va, thuc vat
sach ty » sach y, sach tu, sach thu
xay hoi » xa hoi, tay hoi, cay phoi
ty van » ly van, ta van

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 van xay hoi. hieu ((vien canh) OR (vien can)) chuc va tinh ((va cac) or (va che)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty van xay hoi. hieu ((vien canh) OR (vien can)) chuc va tinh ((va cac) OR (va che)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty van xay hoi. hieu ((vien canh) OR (vien can)) chuc va tinh ((va cac) or (va che)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty van xay hoi. hieu ((vien canh) OR (vien can)) chuc va tinh ((va cac) or (va che)) tre*.