Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac dat » cac dan, cai dat, cac dai
sac ky » cac ky, sai ky
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sac ky)) nang xa hoi. hieu va cac dat va thanh ((vi cua) or (di cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang xa hoi. hieu va cac dat va thanh ((vi cua) OR (di cua)) vat.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang xa hoi. hieu va cac dat va thanh ((vi cua) or (di cua)) vat*.