Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
trung tuan » trung thanh, trung tam, tran tuan
tuan nhung » quan nhung, tuan hung, thuat nhung
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

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 (hieu quang))) or (chieu sach)) - hanh trung tuan nhung cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu lang) OR (hieu quang))) OR (chieu sach)) - hanh trung tuan nhung cong tap toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hieu lang) OR (hieu quang))) or (chieu sach)) - hanh trung tuan nhung cong tap toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu lang) OR (hieu quang))) or (chieu sach)) - hanh trung tuan nhung cong tap toan cau*.