Perhaps you should try some spelling variations:
tieng thuc » kien thuc, trong thuc, trang thuc
doi chieu » doc hieu, doi chi, mot chieu
doc tieng » hoc tieng, luc tieng, noi tieng
nhan dan » phan dau, gian dan, nhan tai
thuc dan » thuc hanh, hoc dan, thuc vat
dan phan » doan phan, dan chan, van phan
dan doc » dan toc, dan hoc, dan soc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (toc thieu)) sach - nhan dan doc tieng thuc dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sach - nhan dan doc tieng thuc dan phan tu.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sach - nhan dan doc tieng thuc dan phan tu*.