Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh chat
trinh thuc » trinh tu, trinh thi
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
theo cau » theo chu, theo cap, theo dau
cau sach » cao sach, hau sach, rau sach
dan chan » dan gian, dan ca, van chat
chan tap » han tap, phan tap, chan ta

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo cau sach - hanh ((trinh thuat) or (trinh thuc)) ((nhung cong) or (thong cong)) dan chan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cau sach - hanh ((trinh thuat) OR (trinh thuc)) ((nhung cong) OR (thong cong)) dan chan tap.
• Adding a wildcard symbol may retrieve word variants: theo cau sach - hanh ((trinh thuat) or (trinh thuc)) ((nhung cong) or (thong cong)) dan chan tap*.