Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh quan
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh mang » nhanh mang, hanh trang, nhanh lang
trinh han » trinh quan
mang cua » manh cua, dung cua, ban cua
ban cong » bang cong, van cong, phan cong

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 - hanh mang cua ban cong ((trinh toan) OR (trinh han)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh mang cua ban cong ((trinh toan) OR (trinh han)) cao*".