Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hang cong » dang cong, hang nong, bang cong
nang cua » mang cua, hang cua, nang dua
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan 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: hoc thiet tach - anh ((nang cua) or (nang luc)) hang cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - anh ((nang cua) OR (nang luc)) hang cong san toan ban*.