Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
trinh van » trinh han, trinh toan, dinh van
nang cong » nang song, dang cong, bang cong
tran chau » tranh chap, tran huu
theo rau » theo mau, theo chu, theo yeu
theo dau » theo mau, thau dau, te dau
cong dan » cong san, cong tan, huong dan
dan tran » dang tran, tan tran, dan than

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo rau) OR (theo dau)) sach - hanh ((trinh van) or (trinh quan)) nang cong dan tran chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo rau) OR (theo dau)) sach - hanh ((trinh van) OR (trinh quan)) nang cong dan tran chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo rau) OR (theo dau)) sach - hanh ((trinh van) or (trinh quan)) nang cong dan tran chau".
• Adding a wildcard symbol may retrieve word variants: ((theo rau) OR (theo dau)) sach - hanh ((trinh van) or (trinh quan)) nang cong dan tran chau*.