Perhaps you should try some spelling variations:
khong dung » thong dung, phuong dung, cuong dung
hoc thiet » hoc thuyet, hoc hien, toc thieu
hoc thieu » toc thieu, hoc hien
tang luan » dung luan
dung tinh » dang tinh, dung ninh, dung tin
toan ban » van ban
ban cua » ban quan

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) or (hoc thieu)) anh - hanh ((tang luan) or (ban cua)) khong dung tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thieu)) anh - hanh ((tang luan) OR (ban cua)) khong dung tinh toan ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (hoc thieu)) anh - hanh ((tang luan) or (ban cua)) khong dung tinh toan ban*.