Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
manh tung » manh hung, thanh tung
ban cong » bang cong, van cong, phan cong
dan van » dang van, doan van, dao van
do van » dao van, vo van, so van

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 - ((manh tung) or (hanh trinh)) cua ban cong ((dan van) or (do van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - ((manh tung) OR (hanh trinh)) cua ban cong ((dan van) OR (do van)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - ((manh tung) or (hanh trinh)) cua ban cong ((dan van) or (do van)) ban*.