Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
cua trong » cua truong, cua trung, ca trong
qua trong » quan trong, qua trinh, qua song
cong san » cong tac
than ban » thanh ban, toan ban, nhuan ban
than man » than ma, thanh san, tran manh

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

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