Perhaps you should try some spelling variations:
toan thiet » hoan thien, luan thiet
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
than tap » han tap, phan tap, than cap
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: ((toan thiet) or (toan tien)) anh - hanh trinh va thong cong dan ((than tap) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toan thiet) OR (toan tien)) anh - hanh trinh va thong cong dan ((than tap) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toan thiet) or (toan tien)) anh - hanh trinh va thong cong dan ((than tap) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ((toan thiet) or (toan tien)) anh - hanh trinh va thong cong dan ((than tap) OR (toan tap))*.