Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trinh hant » trinh hanh, trinh thanh, trinh van
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
dang cong » dung cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 - hanh ((trinh han) or (trinh hant)) dang cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((trinh han) OR (trinh hant)) dang cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trinh han) or (trinh hant)) dang cong dan toan cau*.