Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
huong tinh » khuong tinh, thuong tinh, duong tinh
kieu tinh » lieu tinh, trieu tinh, diep tinh
van nhung » van nhuong, van hung, van phung
toan cau » toan cao, toan ban, toan tap
yeu tin » yeu tan, hieu tin, lieu tin

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

• Performing a fuzzy search may retrieve terms with similar spellings: thiet ((kieu tinh) or (yeu tin)) - canh trinh ((van nhung) OR (va nhung)) huong tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thiet ((kieu tinh) OR (yeu tin)) - canh trinh ((van nhung) OR (va nhung)) huong tinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thiet ((kieu tinh) or (yeu tin)) - canh trinh ((van nhung) OR (va nhung)) huong tinh toan cau".
• Adding a wildcard symbol may retrieve word variants: thiet ((kieu tinh) or (yeu tin)) - canh trinh ((van nhung) OR (va nhung)) huong tinh toan cau*.