Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
chau tre » chay tren, chau tho, cho tre
van hanh » ban hanh, van anh, van ban
cau luc » cau truc, cau phuc
tu sach » thu sach, su sach, te sach
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tu nang) OR (tu nong)) x ho. hieu ve cau luc ((van hanh) or (van thanh)) lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tu nong)) x ho. hieu ve cau luc ((van hanh) OR (van thanh)) lai chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) OR (tu nong)) x ho. hieu ve cau luc ((van hanh) or (van thanh)) lai chau tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) OR (tu nong)) x ho. hieu ve cau luc ((van hanh) or (van thanh)) lai chau tre*.