Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
duong manh » duong van
hoc thien » hoc hien, hoc thieu, hoc thiet
nhan dang » nhan dan, phan dang
tran dang » tran quang, tran hoang, tranh hang
manh van » anh van, menh van, canh 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 thien hach - hanh trinh ((nhan dang) or (tran dang)) duong manh van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh trinh ((nhan dang) OR (tran dang)) duong manh van ban*.