Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
thanh tran » thanh trang, thanh toan, thanh tra
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh tran » hanh trang, hanh tram, thanh trang
dang cong » dung cong
van dang » van dong, van dung, van nang
van quan » van ban
van tan » van tuan, van ban, van tai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - ((hanh tran) OR (thanh tran)) van dang cong ((van quan) OR (van tan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet hach - ((hanh tran) OR (thanh tran)) van dang cong ((van quan) or (van tan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - ((hanh tran) OR (thanh tran)) van dang cong ((van quan) or (van tan)) cau*.