Perhaps you should try some spelling variations:
khong xuong » khong dung, hong vuong, thong huong
thanh trung » thanh tung
thong duong » tuong duong, thong dung, thong huong
chieu sach » chinh sach, chiet tach, chieu sang
hoc chieu » hoc thieu, ho chieu, hoc hien
trung cap » truong cao, trung tam
chan nan » chan nhan, chang nang, chai nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sach - thanh trung cap ((khong xuong) OR (thong duong)) dan ((chan doan) or (chan nan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - thanh trung cap ((khong xuong) OR (thong duong)) dan ((chan doan) OR (chan nan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - thanh trung cap ((khong xuong) OR (thong duong)) dan ((chan doan) or (chan nan))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - thanh trung cap ((khong xuong) OR (thong duong)) dan ((chan doan) or (chan nan))*.