Perhaps you should try some spelling variations:
tra nang » thi nang, kha nang, da nang
van hanh » van thanh, ban hanh, van anh
cau theo » cau thi, cau tao
te sach » toc sach
cu lang » cua lang, tu lang, xu lang
van cam » van lam, van cau, van dam
xuc van » duc van, luc van, vuc van
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 (tra nang)) xa hoi. hieu ((van cam) OR (van nam)) xuc van hanh vi cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((cu lang) OR (tra nang)) xa hoi. hieu ((van cam) OR (van nam)) xuc van hanh vi cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((cu lang) or (tra nang)) xa hoi. hieu ((van cam) OR (van nam)) xuc van hanh vi cau theo".
• Adding a wildcard symbol may retrieve word variants: te sach ((cu lang) or (tra nang)) xa hoi. hieu ((van cam) OR (van nam)) xuc van hanh vi cau theo*.