Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
nhung cong » dung cong, thong cong, hang cong
hanh tang » hanh trang, anh tang, hanh mang
sang tai » hang tai, sang tao, tang tai
tang va » trang va, tang van, thang va
san tai » van tai, han tai, ban tai

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) or (nhieu tang)) - hanh tang va nhung cong ((san tai) OR (sang tai)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (nhieu tang)) - hanh tang va nhung cong ((san tai) OR (sang tai)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (nhieu tang)) - hanh tang va nhung cong ((san tai) OR (sang tai)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (nhieu tang)) - hanh tang va nhung cong ((san tai) OR (sang tai)) cao*.