Perhaps you should try some spelling variations:
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
tang luan » dung luan
dung cong » dung trong
mang cua » manh cua, dung cua, ban cua
cong tac » cong ty
tren cau » tren ca, tren tau, trinh cau
tren cay » trien cay, tren may, ten cay

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 - anh ((tang luan) or (mang cua)) dung cong tac ((tren cau) OR (tren cay))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - anh ((tang luan) OR (mang cua)) dung cong tac ((tren cau) OR (tren cay)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - anh ((tang luan) or (mang cua)) dung cong tac ((tren cau) OR (tren cay))".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - anh ((tang luan) or (mang cua)) dung cong tac ((tren cau) OR (tren cay))*.