Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hanh tranh » hanh trinh, hanh trang, lanh tranh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu

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

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