Perhaps you should try some spelling variations:
cong ngang » cong nhan, cong quang, cong lang
hanh trang » thanh trung, hanh trinh, minh trang
qua trong » quan trong, qua trinh, qua song
ngang tan » nganh toan, nang tai, nang tao
hieu cac » hieu luc, hieu va, hieu van
tan tap » toan tap, han tap, tan tat

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 cac) or (hieu qua)) - ((hanh trang) or (canh tranh)) qua trong cong ngang tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cac) OR (hieu qua)) - ((hanh trang) OR (canh tranh)) qua trong cong ngang tan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cac) or (hieu qua)) - ((hanh trang) or (canh tranh)) qua trong cong ngang tan tap*.