Perhaps you should try some spelling variations:
cau phuong » cac phuong, cuu phuong, va phuong
cau nhung » cam nhung, canh nhung, chua nhung
hieu cac » hieu luc, hieu va, hieu van
cong van » cong vang, cong san, song van
van tuan » van quan, van ban, anh tuan
tuan cao » toan cao, juan cao, quang cao
hieu ca » hieu cua, hieu va, hieu xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu ca) or (hieu cac)) - thanh cong ((cau nhung) or (cau phuong)) cong van tuan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu ca) OR (hieu cac)) - thanh cong ((cau nhung) OR (cau phuong)) cong van tuan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu ca) or (hieu cac)) - thanh cong ((cau nhung) or (cau phuong)) cong van tuan cao*.