Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
cuong cong » cong cong, luong cong, duong cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung tuan, trung cap
dung cua » dung luan, dung cho
cong tan » cong tac, cong san, cong thanh
toan tai » toan tap, doanh tai, toan cao
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 - hanh ((trung cua) or (dung cua)) cuong cong tan ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh ((trung cua) OR (dung cua)) cuong cong tan ((toan tai) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh ((trung cua) or (dung cua)) cuong cong tan ((toan tai) or (toan ban))*.