Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thong than » thong thanh, thong phan, thong nhan
hieu lang » chieu sang, nhieu tang, hieu van
hanh mang » nhanh mang, hanh trang, nhanh lang
cua thong » cua thuong, cua khong, cua tong
thong tan » thong tran, thong tin, thong van
mang cua » manh cua, dung cua, ban cua
tran cao » toan cao, tran chau, trang cho

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (hieu quang)) - hanh mang cua thong ((thong tan) OR (thong than)) tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu quang)) - hanh mang cua thong ((thong tan) OR (thong than)) tran cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (hieu quang)) - hanh mang cua thong ((thong tan) OR (thong than)) tran cao".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (hieu quang)) - hanh mang cua thong ((thong tan) OR (thong than)) tran cao*.