Perhaps you should try some spelling variations:
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
trung va » truong va, trang va, trung ha
toan ban » van 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: hoc chiet tach - manh ((tung va) OR (trung va)) dung cong manh toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - manh ((tung va) OR (trung va)) dung cong manh toan ban*".