Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hanh trinh » canh tranh, hanh chinh
kien sach » dien sach, vien bach, kien mac
va phuong » va thuong, cac phuong
hoc kien » hoc hien, hoc vien, hoa kien
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
gian dan » gian lang
gian cua » gian xu, ban cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc kien sach - hanh trinh va phuong cong san ((gian dan) OR (gian cua))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc kien sach - hanh trinh va phuong cong san ((gian dan) OR (gian cua))".
• Adding a wildcard symbol may retrieve word variants: hoc kien sach - hanh trinh va phuong cong san ((gian dan) OR (gian cua))*.