Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh luan » trinh luat, trinh quan, trinh han
hoc thien » hoc hien, hoc thieu, hoc thiet
luan nang » luan van, van nang, luan san
song van » hoang van, trong van, duong van
dang van » hoang van, hang va
quan cau » quang cao, toan cau, quan ha

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 - canh trinh luan nang ((song van) or (dang van)) quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - canh trinh luan nang ((song van) OR (dang van)) quan cau*.