Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
dua tren » dung tren
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va tinh » may tinh
y nang » ky nang, ly nang, v nang
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ve pham duc ((va thanh) OR (va tinh)) dai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ve pham duc ((va thanh) OR (va tinh)) dai ((dua tren) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu ve pham duc ((va thanh) OR (va tinh)) dai ((dua tren) or (cua te))*".