Perhaps you should try some spelling variations:
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
ngang toan » nganh toan, dang toan
quang toan » quang tuan, quang tran, quang doan
trang cap » trung cap, trong cap, tranh chap
cap hoang » cam hoang, cau hoang, van hoang

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 (chieu sach)) - hanh trang cap hoang vuong ((ngang toan) OR (quang toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chieu sach)) - hanh trang cap hoang vuong ((ngang toan) OR (quang toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (chieu sach)) - hanh trang cap hoang vuong ((ngang toan) OR (quang toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (chieu sach)) - hanh trang cap hoang vuong ((ngang toan) OR (quang toan)) cao*.