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
chinh cua » chinh ca, chinh sua, chinh luan
tran chau » tranh chap, tran huu
hinh cua » sinh cua, tinh cua, dinh cua
cong tan » cong tac, cong san, cong thanh
tran cau » toan cau, ran cau, tra cau

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((chinh cua) OR (hinh cua)) thong cong tan ((tran cau) OR (tran chau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((chinh cua) or (hinh cua)) thong cong tan ((tran cau) OR (tran chau))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((chinh cua) or (hinh cua)) thong cong tan ((tran cau) OR (tran chau))*.