Perhaps you should try some spelling variations:
nganh xakmmy » nganh xay
can tranh » canh tranh, tan tran, van ranh
tranh my » trinh my, tran sy, anh my
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
su can » su van, su cao, tu can
my khi » ly khi, ky khi, my chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su can tranh my khi đong luc ) or ( ((tu sach) OR (thu sach)) nganh xakmmy khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su can tranh my khi đong luc ) OR ( ((tu sach) OR (thu sach)) nganh xakmmy khi đong luc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su can tranh my khi đong luc ) or ( ((tu sach) OR (thu sach)) nganh xakmmy khi đong luc ))*".