Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
vat danh » va danh, van danh, luat danh
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky nang xa hoi. hieu van chat thuc vat danh ((vi cua) or (le cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu van chat thuc vat danh ((vi cua) OR (le cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. hieu van chat thuc vat danh ((vi cua) or (le cua)) tre*.