Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
cong khi » cong thai, khong khi, co khi
sach han » sach tham, sach danh, sach nang
vu sach » vu bach, su sach, vu khach
su hoc » tu hoc, du hoc, su ho
so hoc » co hoc, mo hoc, so hoa
han y » nhan y, han 2, han 1
y khi » ly khi, ky khi, my khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((su hoc) OR (so hoc)) nganh cong khi đong luc ) or ( vu sach han y khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((su hoc) OR (so hoc)) nganh cong khi đong luc ) OR ( vu sach han y khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((su hoc) OR (so hoc)) nganh cong khi đong luc ) or ( vu sach han y khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( ((su hoc) OR (so hoc)) nganh cong khi đong luc ) or ( vu sach han y khi đong luc ))*.