Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
tieu sach » chieu sach, dien sach, te sach
trung cao » truong cao, trung cap, trung ca
trung co » trung bo, trong co, truong cao
cong tac » cong ty
tac nhan » tao nhan, cac nhan, dac nhan
nhan tap » nhan tai, nhan tao, han tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - hanh ((trung cao) or (trung co)) thuong cong tac nhan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh ((trung cao) OR (trung co)) thuong cong tac nhan tap.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh ((trung cao) or (trung co)) thuong cong tac nhan tap*.