Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hiem ngan » kim ngan, viem gan
trinh xay » trinh ky
trong van » trong cac
phong cau » phong cac, phong cai, phong cach
thong cau » thong cac, thong cap, thong tu
hoc hiem » hoc hien, hoc thieu, hoc thiet

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hiem ngan - canh trinh xay dung trong van ((phong cau) or (thong cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hiem ngan - canh trinh xay dung trong van ((phong cau) OR (thong cau)).
• Adding a wildcard symbol may retrieve word variants: hoc hiem ngan - canh trinh xay dung trong van ((phong cau) or (thong cau))*.