Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
hanh trinh » canh tranh, hanh chinh
nhung dung » phuong dung, ung dung, thong dung
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
van thanh » ban thanh, van tuan
van toan » van tuan, van tan, manh toan

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