Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
van thanh » ban thanh, van tuan
chau tre » chau tho, cho tre, cau tra
van hanh » ban hanh, van anh, van ban
sach tu » sach thu, cach tu, sach ty
tu sach » thu sach, su sach, te sach
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
ve cau » ke cau, va cau, ve cac
x hoi » xa hoi, o hoi, x ho

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