Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thien hach » thien thanh, hien hanh
hieu cach » hieu cac, chieu sach, hieu ca
trinh ve » trinh he, trinh va, trinh vi
ve thong » he thong, va thong, ve phong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: hoc ((hieu cach) or (thien hach)) - hanh trinh ve thong ((cong dan) or (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (thien hach)) - hanh trinh ve thong ((cong dan) OR (cong san)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) or (thien hach)) - hanh trinh ve thong ((cong dan) or (cong san)) toan tap*.