Perhaps you should try some spelling variations:
trinh suat » trinh luat, trinh sat, trinh luan
trinh quan » tinh quang, trinh luat, trinh han
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
ho chieu » theo chieu, doi chieu, mot chieu
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) OR (hoc thieu)) xanh - hanh ((trinh suat) or (trinh quan)) thong cong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - hanh ((trinh suat) OR (trinh quan)) thong cong tan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) xanh - hanh ((trinh suat) or (trinh quan)) thong cong tan toan tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) xanh - hanh ((trinh suat) or (trinh quan)) thong cong tan toan tap*.