Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
thanh tung » thanh cong
dang luong » nang luong, dung luong, hang luong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
luong dan » huong dan, luong dao, luong van
cua dang » cua cong, cua ban
than cau » phan cau, than cap, thanh chau
toan cau » 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: hoc thiet hach - ((thanh trung) or (thanh tung)) cua dang luong dan ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - ((thanh trung) OR (thanh tung)) cua dang luong dan ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - ((thanh trung) or (thanh tung)) cua dang luong dan ((than cau) or (toan cau))*.