Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
trinh van » trinh han, trinh quan, trinh toan
vuong tin » luong tin, vuong tan, duong tien
ho thiet » hoc thiet, hoa thiet, so thiet
trinh va » trinh vat, trinh ve, trinh vi
tin toan » tinh toan, nin toan, trinh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho thiet tach - canh ((trinh va) or (trinh van)) hoang vuong tin toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - canh ((trinh va) OR (trinh van)) hoang vuong tin toan cao.
• Adding a wildcard symbol may retrieve word variants: ho thiet tach - canh ((trinh va) or (trinh van)) hoang vuong tin toan cao*.