Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang
nhieu tang » hieu lang, nhiet nang
hanh trinh » canh tranh, hanh chinh
trinh han » trinh quan
dang cong » dung cong
han dang » phan dang, nhan dang, chan dang
cong tuc » cong thuc, cong tac, cong suc
tuc va » thuc va, truc va, tuc xa
va bao » va bai

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