Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, mot chieu
vat thong » va thong, mat thong, vat khong
vat trong » viet trong, cay trong, dot trong
ho chieu » theo chieu, hoc thieu, mot chieu
cong san » cong tac
san phan » san pham, van phan, sat phan
phan cau » phan dau, phan cac, phan tu

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: ((ho chieu) OR (doi chieu)) tinh - canh trinh ((vat thong) OR (vat trong)) cong san phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) tinh - canh trinh ((vat thong) OR (vat trong)) cong san phan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) tinh - canh trinh ((vat thong) OR (vat trong)) cong san phan cau*.