Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hanh trinh » canh tranh, hanh chinh
dien sach » dien anh
va phuong » va thuong, cac phuong
hoc dien » hoc hien, hoc vien, hoc dieu
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 dien sach - hanh trinh va phuong cong san ((gian dan) or (gian cua))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dien sach - hanh trinh va phuong cong san ((gian dan) OR (gian cua)).
• Adding a wildcard symbol may retrieve word variants: hoc dien sach - hanh trinh va phuong cong san ((gian dan) or (gian cua))*.