Perhaps you should try some spelling variations:
phap duy » phap day, pham duy, phan duy
van dinh » van minh, van dich, va dinh
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va phap » va phat, ban phap
duy van » duy vat, dung van
ve cua » de cua, te cua, ve cum
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 ((ky lang) or (ky nang)) xa hoi. hieu va phap duy van dinh ((ve cua) or (le cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu va phap duy van dinh ((ve cua) OR (le cua)) te.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. hieu va phap duy van dinh ((ve cua) or (le cua)) te*.