Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
hanh trinh » hanh chinh
phan chung » phan cung, phan hung, phan thuong
chung nong » chung thong, chuong dong, hang nong
nong anh » nong lanh, dong anh, hong anh
tuan cau » toan cau, quan cau, tuan cu

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) OR (thien hach)) - ((hanh trinh) or (canh tranh)) phan chung nong anh tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - ((hanh trinh) OR (canh tranh)) phan chung nong anh tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (thien hach)) - ((hanh trinh) or (canh tranh)) phan chung nong anh tuan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (thien hach)) - ((hanh trinh) or (canh tranh)) phan chung nong anh tuan cau*.