Perhaps you should try some spelling variations:
chiet tach » chieu sach
thong cong » trong cong, tong cong, thong thong
cong thanh » dong thanh, cong trinh, cong tan
ho chiet » ho chieu, ho thiet, hoc thiet
trung va » truong va, trang va, trung ha
tran tap » tran tan, tran tuan, trang tai
toan tap » toan ban
tung va » tuong va, dung va, vung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - thanh ((tung va) or (trung va)) thong cong thanh ((tran tap) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - thanh ((tung va) OR (trung va)) thong cong thanh ((tran tap) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - thanh ((tung va) or (trung va)) thong cong thanh ((tran tap) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - thanh ((tung va) or (trung va)) thong cong thanh ((tran tap) OR (toan tap))*.