Perhaps you should try some spelling variations:
nuoc cong » hoc cong
van hanh » van thanh, van anh, van minh
ban hanh » ban hang
cau tren » cu tren, dau tren, ca tren
cong ky » cuong ky, cong ty, hong ky
hieu ke » hieu kem, chieu ke, hieu ky
ke cau » ket cau
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: nuoc cong ky nang x hoi. hieu ke cau truc ((((van hanh) OR (van ban))) or (ban hanh)) ke cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc cong ky nang x hoi. hieu ke cau truc ((((van hanh) OR (van ban))) OR (ban hanh)) ke cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc cong ky nang x hoi. hieu ke cau truc ((((van hanh) OR (van ban))) or (ban hanh)) ke cau tren*".