Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trinh toan » tinh toan, thanh toan, trinh han
hoc thieu » toc thieu, hoc hien
cong cong » cong dong, trong cong, dung cong
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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