Perhaps you should try some spelling variations:
hien cong » thien cong, tien cong, dien cong
hieu hien » bieu hien, dieu hien, chieu chien
cong cua » cong cu, dong cua, huong cua
va tinh » may tinh
tu sach » thu sach, su sach, te sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky danh
cua va » cua vat, chua va, cua van
va chu » va cau, va chi

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 ((ky dang) or (ky nang)) xay hoi. hieu hien cong cua va tinh ((va chu) or (va che)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky nang)) xay hoi. hieu hien cong cua va tinh ((va chu) OR (va che)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) or (ky nang)) xay hoi. hieu hien cong cua va tinh ((va chu) or (va che)) tre*.