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

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 van dang cong ((((van quan) OR (van ban))) OR (van tan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet hach - hanh tran van dang cong ((((van quan) OR (van ban))) or (van tan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - hanh tran van dang cong ((((van quan) OR (van ban))) or (van tan)) cau*.