Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
nhung dung » phuong dung, ung dung, thong dung
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trinh cua » trinh luat, trinh quan, trinh luan
van thanh » ban thanh
tinh cua » sinh cua, tinh chat, tranh cua
van tuan » van quan, van ban, anh tuan

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)) nhung dung ((van thanh) or (van tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh ((trinh cua) OR (tinh cua)) nhung dung ((van thanh) OR (van tuan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - hanh ((trinh cua) OR (tinh cua)) nhung dung ((van thanh) or (van tuan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh ((trinh cua) OR (tinh cua)) nhung dung ((van thanh) or (van tuan)) ban*.