Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chiet tach » chieu sach
chu xanh » chu manh, chieu xanh, chua xang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban
nang va » nang van, hang va, bang va
nang ma » tang ma, sang ma, nang cao

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 ((chu xanh) OR (chiet tach)) - anh ((nang va) OR (nang ma)) phuong cong tan toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu xanh) or (chiet tach)) - anh ((nang va) OR (nang ma)) phuong cong tan toan tap~".
• Adding a wildcard symbol may retrieve word variants: theo ((chu xanh) or (chiet tach)) - anh ((nang va) OR (nang ma)) phuong cong tan toan tap*.