Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trung tuan » trung thanh, trung tam, tran tuan
thong cong » tong cong, thong thong, phong chong
hoc thieu » toc thieu, hoc hien
trung cap » truong cao, trung tam
dan toan » van toan, dan than, manh toan
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 - thanh ((trung cap) or (trung tuan)) ((thong cong) OR (trong cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh ((trung cap) OR (trung tuan)) ((thong cong) OR (trong cong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - thanh ((trung cap) or (trung tuan)) ((thong cong) OR (trong cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh ((trung cap) or (trung tuan)) ((thong cong) OR (trong cong)) dan toan cao*.