Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh dung » thanh dung, anh dung, hanh dong
dung phan » dung nhan, dung luan, dung ha
phan cong » thanh cong
cong cong » cong dong, trong cong, dung cong
cong van » cong vang, cong san, song van
van han » van hanh, van phan, van nhan
han tai » hang tai, nhan tai, van tai

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) or (toc thieu)) tach - hanh dung phan cong cong van han tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (toc thieu)) tach - hanh dung phan cong cong van han tai*.