Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
chinh ca » chinh ta, chinh va, chinh tai
ky lang » ky dang, ky tang, tay lang
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
ca te » cua te, ca ve, ca me

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

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