Perhaps you should try some spelling variations:
thieu tach » thien hach, chiet tach, chieu sach
hanh trinh » hanh chinh
hoc thieu » toc thieu, hoc hien
han trong » hanh trong, nhan trong, phan trong
tran chau » tranh chap, tran huu
cong san » cong tac
tran cau » toan cau, ran cau, tra cau

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 tach - ((hanh trinh) OR (canh tranh)) han trong cong san ((tran cau) or (tran chau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tach - ((hanh trinh) OR (canh tranh)) han trong cong san ((tran cau) OR (tran chau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tach - ((hanh trinh) OR (canh tranh)) han trong cong san ((tran cau) or (tran chau))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tach - ((hanh trinh) OR (canh tranh)) han trong cong san ((tran cau) or (tran chau))*.