Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
trang cua » tranh cua, tang cua, thang cua
trung cua » truong cua, trung tuan, trung cap
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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 ((trang cua) OR (trung cua)) thong ((cong dan) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((trang cua) OR (trung cua)) thong ((cong dan) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((trang cua) OR (trung cua)) thong ((cong dan) or (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trang cua) OR (trung cua)) thong ((cong dan) or (cong tan)) toan cau*.