Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
mang va » mang vua, hang va, bang va

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 ((mang va) or (ban va)) thong cong san ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((mang va) OR (ban va)) thong cong san ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((mang va) or (ban va)) thong cong san ((toan cau) or (toan tap))*.