Perhaps you should try some spelling variations:
va tuyen » va truyen, tac tuyen, ke tuyen
hanh dai » hanh tai, hanh dao, vanh dai
toc sach » hoc sach, doc sach, thuoc sach
tra nang » thi nang, kha nang, da nang
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa
dai va » mai va

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