Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
doi hieu » doi chieu, doc hieu, doi hien
tinh cua » trinh cua, sinh cua, tinh chat
dan toan » van toan, dan than, manh toan
van tuan » van quan, van ban, anh tuan
sinh va » sinh vat, tinh va, dinh van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - hanh ((tinh cua) or (sinh va)) hang cong ((dan toan) or (van tuan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ((tinh cua) OR (sinh va)) hang cong ((dan toan) OR (van tuan)) tap.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh ((tinh cua) or (sinh va)) hang cong ((dan toan) or (van tuan)) tap*.