Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
tinh khang » tinh khong, trinh khung, tinh quang
hang thong » hang thuong, hang khong, mang thong
thong cap » thong cac, trung cap, thong cua
khang va » hang va, thang va, khang a
va hang » van hang, va nang, va lang
cap lua » cap luat, cay lua, ca lua
lua van » luan van, luu van, qua van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sach) or (chieu tinh)) - tinh khang va hang thong cap lua van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (chieu tinh)) - tinh khang va hang thong cap lua van.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sach) or (chieu tinh)) - tinh khang va hang thong cap lua van*.