Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tranh han » tranh hang, tranh ban, tran han
trinh han » trinh quan
khi xanh » khia canh, thi hanh, thi anh
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi khi xanh - canh ((tranh han) or (trinh han)) nhung cong tap toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi khi xanh - canh ((tranh han) OR (trinh han)) nhung cong tap toan tap.
• Adding a wildcard symbol may retrieve word variants: doi khi xanh - canh ((tranh han) or (trinh han)) nhung cong tap toan tap*.