Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, nhung don
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
trung cua » truong cua, trung tuan, trung cap
hang cong » dang cong, hang nong, bang cong
dan thai » dang thai, dan thi, dan than
thai cao » tai cao, thoai cac, thuat cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) OR (kien sach)) - thanh trung cua ((nhung cong) or (hang cong)) dan thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - thanh trung cua ((nhung cong) OR (hang cong)) dan thai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (kien sach)) - thanh trung cua ((nhung cong) or (hang cong)) dan thai cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (kien sach)) - thanh trung cua ((nhung cong) or (hang cong)) dan thai cao*.