Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
cong thanh » dong thanh, cong tan, truong thanh
trung vap » trung cap, trung va, trung van
vap nhung » va nhung, ve nhung, voi nhung
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - thanh trung vap nhung ((cong thanh) or (cong trinh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh trung vap nhung ((cong thanh) OR (cong trinh)) toan tap.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh trung vap nhung ((cong thanh) or (cong trinh)) toan tap*.