Perhaps you should try some spelling variations:
thieu quang » thien quan, trien quang, hieu quan
hieu quang » hieu quan, hieu qua, diep quang
hanh trinh » canh tranh, hanh chinh
cong ngang » cong quang, cong lang, cong nong
trinh cua » tinh cua, trinh luat, trinh quan
cong nhan » cong nhat, cong thanh, cong san
cua dung » cua dang, cua dong, qua dung
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho ((hieu quang) OR (thieu quang)) - hanh trinh cua dung ((cong ngang) or (cong nhan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu quang) OR (thieu quang)) - hanh trinh cua dung ((cong ngang) OR (cong nhan)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu quang) OR (thieu quang)) - hanh trinh cua dung ((cong ngang) or (cong nhan)) toan tap".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu quang) OR (thieu quang)) - hanh trinh cua dung ((cong ngang) or (cong nhan)) toan tap*.