Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
nghiem duoc » nghiem thuoc, nghe duoc
canh trinh » canh tranh, hanh trinh, canh tinh
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
thu canh » thuc hanh, thu cong, thu ban
thiet du » thiet de, thiet yeu, thiet ke
duoc hoc » quoc hoi
du hoc » tu hoc
kinh » dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu canh trinh thiet du hoc ) or ( ((thuoc sach) or (thuat sach)) kinh nghiem duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu canh trinh thiet du hoc ) OR ( ((thuoc sach) OR (thuat sach)) kinh nghiem duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thu canh trinh thiet du hoc ) or ( ((thuoc sach) or (thuat sach)) kinh nghiem duoc hoc ))*.