Perhaps you should try some spelling variations:
va tuyen » va truyen, tac tuyen, ke tuyen
va trien » va truyen, va thiet, va tieng
tra nang » thi nang, kha nang, da nang
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
te sach » toc sach
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
va cao » va cac, va co, va dao
tuc va » thuc va, truc va, tuc xa

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 ((tu lenh) or (tra nang)) xa hoi. hieu va cao tuc va hanh dai ((va trien) OR (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu lenh) OR (tra nang)) xa hoi. hieu va cao tuc va hanh dai ((va trien) OR (va tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu lenh) or (tra nang)) xa hoi. hieu va cao tuc va hanh dai ((va trien) OR (va tuyen))".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu lenh) or (tra nang)) xa hoi. hieu va cao tuc va hanh dai ((va trien) OR (va tuyen))*.