Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
thanh tung » thanh cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cap nhung » cam nhung, vap nhung, dap nhung
tung cap » trung cap, cung cap, thong cap
cong dan » cong tan, huong dan, cong tac
cong san » cong tac
than cap » khan cap, thanh lap, thanh cac

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 tung cap nhung ((((cong dan) or (cong dong))) or (cong san)) than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - thanh tung cap nhung ((((cong dan) OR (cong dong))) OR (cong san)) than cap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - thanh tung cap nhung ((((cong dan) or (cong dong))) or (cong san)) than cap*.