Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
tru nang » tra nang, tri nang, truc nano
van hanh » van thanh, ban hanh, van anh
van cam » van nam, van lam, van dam
van cau » van dau, van hau, van chat
xuc van » duc van, luc van, vuc van
cu lang » cua lang, tu lang, xu lang
te sach » toc sach
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((cu lang) or (tru nang)) xa hoi. hieu ((van cam) OR (van cau)) xuc van hanh vi cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((cu lang) OR (tru nang)) xa hoi. hieu ((van cam) OR (van cau)) xuc van hanh vi cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((cu lang) or (tru nang)) xa hoi. hieu ((van cam) OR (van cau)) xuc van hanh vi cau theo".
• Adding a wildcard symbol may retrieve word variants: te sach ((cu lang) or (tru nang)) xa hoi. hieu ((van cam) OR (van cau)) xuc van hanh vi cau theo*.