Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » hanh chinh
phong cong » phong chong, thong cong, chong cong
cong quang » luong quang, thong quang, duong quang
thanh chau » thanh cha, thanh cham, thanh chu
hoc thieu » toc thieu, hoc hien
tuan chau » tran chau, chuan chau, tuan thu
va phong » van phong, va phuong, va 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 phong cong quang ((tuan chau) OR (thanh chau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - ((canh tranh) OR (hanh trinh)) va phong cong quang ((tuan chau) OR (thanh chau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - ((canh tranh) or (hanh trinh)) va phong cong quang ((tuan chau) OR (thanh chau))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - ((canh tranh) or (hanh trinh)) va phong cong quang ((tuan chau) OR (thanh chau))*.