Perhaps you should try some spelling variations:
vien cong » viec cong, tien cong, dien cong
hieu vien » hieu hien, hieu viec, thieu nien
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 danh » ky anh
ky dang » ky nang
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 danh)) xay hoi. hieu vien 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 danh)) xay hoi. hieu vien cong cua va tinh ((va chu) OR (va che)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky dang) OR (ky danh)) xay hoi. hieu vien cong cua va tinh ((va chu) or (va che)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) OR (ky danh)) xay hoi. hieu vien cong cua va tinh ((va chu) or (va che)) tre*.