Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thanh toan » thanh hoa, thanh san, tinh toan
theo phap » thi phap
phap tinh » phap sinh, phap tieng, phap tang
hanh mang » nhanh mang, hanh trang, nhanh lang
manh toan » anh tuan, tinh toan
anh mang » anh bang, anh dang, anh nang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo phap tinh - ((anh mang) OR (hanh mang)) va nhung cong ((manh toan) OR (thanh toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo phap tinh - ((anh mang) OR (hanh mang)) va nhung cong ((manh toan) or (thanh toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: theo phap tinh - ((anh mang) OR (hanh mang)) va nhung cong ((manh toan) or (thanh toan)) cao*.