Perhaps you should try some spelling variations:
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua
manh cua » doanh cua, ban cua
tong tap » tuong tac, trong tan, cong tac
cong tan » cong tac, cong san, cong thanh
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: theo hieu lang - hanh ((tranh cua) OR (manh cua)) cong ((tong tap) or (cong tan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh ((tranh cua) OR (manh cua)) cong ((tong tap) OR (cong tan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh ((tranh cua) OR (manh cua)) cong ((tong tap) or (cong tan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh ((tranh cua) OR (manh cua)) cong ((tong tap) or (cong tan)) toan cao*.