Perhaps you should try some spelling variations:
hoach dinh » hoang dinh
sach nganh » sach ngan, sach tranh, cac nganh
dinh cong » dinh cuong, dinh hong, dinh long
nganh co » nganh cong, nganh hoa, nganh y
su hoach » quy hoach, thu hoach, qui hoach
cong khi » cong thai, khong khi, cong ha
vu sach » vu bach, su sach, vu khach

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach nganh co khi đong luc ) OR ( su hoach dinh cong khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( vu sach nganh co khi đong luc ) or ( su hoach dinh cong khi đong luc ))*.