Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
huong cua » dung cua
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
hang cua » mang cua, hang ca, thong cua
cong tan » cong tac, cong san, cong thanh
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu quang - hanh ((hang cua) or (huong cua)) dung cong tan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - hanh ((hang cua) OR (huong cua)) dung cong tan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - hanh ((hang cua) or (huong cua)) dung cong tan ((toan cao) or (toan ban))*.