Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
ban thong » ban trong, ban tuong, ban tong
phong cai » phong tai, phong cach, phong canh
phong cac » phong cach, thong cac, phuong cach
khi xanh » khia canh, thi hanh, thi anh
cach van » cac van, bach van, canh van
cong dan » cong san, cong tan, huong dan

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 - cach van ban thong cong dan ((phong cai) or (phong cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi khi xanh - cach van ban thong cong dan ((phong cai) OR (phong cac)).
• Adding a wildcard symbol may retrieve word variants: doi khi xanh - cach van ban thong cong dan ((phong cai) or (phong cac))*.