Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
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 tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai 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 thiet tach - hanh ((trinh cua) or (tinh cua)) bang cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh ((trinh cua) OR (tinh cua)) bang cong tap toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh ((trinh cua) or (tinh cua)) bang cong tap toan ban*.