Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
tang hanh » tang thanh, dang hanh, nang hanh
tuong va » truong va, thuong va, luong va
hanh cac » hang cac, hanh cat, nhanh cay

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 tuong va ((nhung cong) or (thong cong)) tang hanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh tuong va ((nhung cong) OR (thong cong)) tang hanh cac.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh tuong va ((nhung cong) or (thong cong)) tang hanh cac*.