Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
tuong cua » truong cua, huong cua, thong cua
hoc hieu » hoc thieu, hoc hien, doc hieu
tung cua » trung cua, dung cua, tang cua
cong ban » cong bang, cong san, cong tan
nhan cau » nhanh cau, phan cau, nhin cau
nhan sau » nhan su, nhan san, nhanh cau

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 - thanh ((tung cua) or (tuong cua)) trong cong ban ((nhan cau) or (nhan sau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - thanh ((tung cua) OR (tuong cua)) trong cong ban ((nhan cau) OR (nhan sau)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - thanh ((tung cua) or (tuong cua)) trong cong ban ((nhan cau) or (nhan sau))*.