Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
sach ngan » sach ngon, sach nha, sach han
thanh hai » thanh phan, thanh hoa, thanh san
cac nganh » hoc nganh
hang hai » hoang hai, hang tai, hang va
cong tan » cong tac, cong san, cong thanh
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach ngan ((hang hai) OR (thanh hai)) đong luc ) or ( cua cac nganh cong tan đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach ngan ((hang hai) OR (thanh hai)) đong luc ) OR ( cua cac nganh cong tan đong luc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach ngan ((hang hai) OR (thanh hai)) đong luc ) or ( cua cac nganh cong tan đong luc ))*".