Perhaps you should try some spelling variations:
thuong trong » thong trong, duong trong, thuoc trong
thiet hach » thien hach, thuyet hach, thiet hai
trinh van » trinh han, trinh quan, trinh toan
trong van » trong cac
ho thiet » hoc thiet, hoa thiet, so thiet
trinh va » trinh vat, trinh ve, trinh vi
van tan » van tuan, van ban, van tai
tan ban » toan ban, tang 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: ho thiet hach - canh ((trinh va) or (trinh van)) thuong trong van tan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet hach - canh ((trinh va) OR (trinh van)) thuong trong van tan ban*.