Perhaps you should try some spelling variations:
tranh cong » thanh cong, tran cong, trang cong
trinh cong » trinh dung
anh ngan » anh nhan, nhanh ngan, doanh ngan
su sach » so sach, vu sach
ngan ky » nganh ky, nhan ky, ngan hay
so anh » so sanh, so danh, do anh
ky khi » ky thi, ly 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 sach ((tranh cong) or (trinh cong)) khi đong luc ) or ( so anh ngan ky khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach ((tranh cong) OR (trinh cong)) khi đong luc ) OR ( so anh ngan ky khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( su sach ((tranh cong) or (trinh cong)) khi đong luc ) or ( so anh ngan ky khi đong luc ))*.