Perhaps you should try some spelling variations:
hoach nganh » hoc nganh
thuat san » thuat toan, thuat song, thuat lanh
san nganh » dang nganh, sang ngang, cac nganh
cong thai » cong hai, hong thai, cong thanh
nganh hoa » thanh hoa, khanh hoa, danh hoa
cong khi » khong khi, co khi, cong ha
hoa hoi » khoa hoi, hoa hoc, hoa doi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuat san nganh ((cong khi) OR (cong thai)) đong luc ) or ( thu hoach nganh hoa hoi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat san nganh ((cong khi) OR (cong thai)) đong luc ) OR ( thu hoach nganh hoa hoi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuat san nganh ((cong khi) OR (cong thai)) đong luc ) or ( thu hoach nganh hoa hoi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( thuat san nganh ((cong khi) OR (cong thai)) đong luc ) or ( thu hoach nganh hoa hoi đong luc ))*.