Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, nhieu tang
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (((chieu sang) OR (chieu sach)))) - hanh trinh vat nhung cong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (((chieu sang) OR (chieu sach)))) - hanh trinh vat nhung cong tan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) or (((chieu sang) OR (chieu sach)))) - hanh trinh vat nhung cong tan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (((chieu sang) OR (chieu sach)))) - hanh trinh vat nhung cong tan toan tap*.