Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » hanh chinh
thong cong » trong cong, tong cong, thong thong
cong quang » luong quang, thong quang, duong quang
chuan chau » chuan ha, chua chay, chua cau
chuan chat » chuan ha, luan chat, chua chay
hoc thieu » toc thieu, hoc hien
va thong » va thuong, va phuong, he thong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - ((canh tranh) or (hanh trinh)) va thong cong quang ((chuan chau) OR (chuan chat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - ((canh tranh) OR (hanh trinh)) va thong cong quang ((chuan chau) OR (chuan chat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - ((canh tranh) or (hanh trinh)) va thong cong quang ((chuan chau) OR (chuan chat))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - ((canh tranh) or (hanh trinh)) va thong cong quang ((chuan chau) OR (chuan chat))*.