Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
phan tong » phan trong, phan cong, han tong
thanh cac » hanh cac, thanh bac, thanh ca
doi hieu » doi chieu, doc hieu, doi hien
cua phan » cua nhan, cua phap, cua han
tong dan » tuong dan, thong dan, trong dan
than cap » khan cap, thanh lap, than cua

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 - ((thanh trung) or (thanh tung)) cua phan tong dan ((than cap) OR (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - ((thanh trung) OR (thanh tung)) cua phan tong dan ((than cap) OR (thanh cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - ((thanh trung) or (thanh tung)) cua phan tong dan ((than cap) OR (thanh cac))".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - ((thanh trung) or (thanh tung)) cua phan tong dan ((than cap) OR (thanh cac))*.