Perhaps you should try some spelling variations:
trinh mach » tinh mach, trinh minh, trinh may
trinh lich » trinh kinh
thong cong » trong cong, tong cong, thong thong
truong va » truong dai, truong cao, truong dao
san thanh » ban thanh, van thanh, son thanh
thanh cau » thanh chau, thanh mau, nhanh cau
trung va » trang va, trung ha, trung tam
cong san » cong tac

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: hoc ((trinh mach) OR (trinh lich)) - thanh ((trung va) OR (truong va)) thong cong san thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((trinh mach) OR (trinh lich)) - thanh ((trung va) or (truong va)) thong cong san thanh cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((trinh mach) OR (trinh lich)) - thanh ((trung va) or (truong va)) thong cong san thanh cau*.