Perhaps you should try some spelling variations:
thieu tach » thien hach, chiet tach, chieu sach
hanh trinh » canh tranh, hanh chinh
nhan trong » nhuan trong, nhat trong, nhin trong
tranh chap » tranh cua, trinh chat
hoc thieu » toc thieu, hoc hien
han trong » hanh trong, phan trong, than trong
cong san » cong tac
tran cau » tran chau, toan cau, ran 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 ((han trong) OR (nhan trong)) cong san ((tran cau) or (tranh chap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tach - hanh trinh ((han trong) OR (nhan trong)) cong san ((tran cau) OR (tranh chap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tach - hanh trinh ((han trong) OR (nhan trong)) cong san ((tran cau) or (tranh chap))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tach - hanh trinh ((han trong) OR (nhan trong)) cong san ((tran cau) or (tranh chap))*.