Perhaps you should try some spelling variations:
chiet tach » chieu sach
trinh quan » tinh quang, trinh han
hoc chiet » hoc thiet, hoc nhiet, hoc hien
tong cong » trong cong, cong cong, dung cong
van toan » van tuan, van tan, van thanh
van tai » von tai, van tuan
luat » luan, xuat

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 - hanh ((trinh luat) or (trinh quan)) tong cong ((van toan) or (van tai)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh ((trinh luat) OR (trinh quan)) tong cong ((van toan) OR (van tai)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh ((trinh luat) or (trinh quan)) tong cong ((van toan) or (van tai)) tap*.