Perhaps you should try some spelling variations:
thuyet tach » thuyet mach, thuyet xac, thuyet cac
thuyet hach » thuyet mach, thuyet xac, thuyet cac
trinh cua » trinh luat, trinh quan, trinh luan
bang cong » dang cong, bang song, hang cong
tinh cua » sinh cua, tinh chat, tranh cua
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thuyet tach) OR (thuyet hach)) - hanh ((trinh cua) or (tinh cua)) bang cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuyet tach) OR (thuyet hach)) - hanh ((trinh cua) OR (tinh cua)) bang cong tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thuyet tach) OR (thuyet hach)) - hanh ((trinh cua) or (tinh cua)) bang cong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thuyet tach) OR (thuyet hach)) - hanh ((trinh cua) or (tinh cua)) bang cong tan toan ban*.