Perhaps you should try some spelling variations:
pham quy » pham duy, pham huy, phap quy
quy gia » quoc gia
vu pham » su pham, vi pham, vu kham
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
hieu vu » hieu va, hieu ve, hieu su
y nang » ky nang, v nang, may nang
ban su » ban sua, dan su, ban tu
van su » dan su

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 ((y nang) or (ly nang)) mai hoi. hieu vu pham quy gia thanh ((ban su) OR (van su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) mai hoi. hieu vu pham quy gia thanh ((ban su) OR (van su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (ly nang)) mai hoi. hieu vu pham quy gia thanh ((ban su) OR (van su)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ly nang)) mai hoi. hieu vu pham quy gia thanh ((ban su) OR (van su)) triet*.