Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh dai » thanh tai, thanh dat, thanh oai
dua tren » dung tren
te sach » toc sach
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
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: te sach y nang x hoi. hieu va pham duc va ((thanh dai) OR (thanh hai)) ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. hieu va pham duc va ((thanh dai) OR (thanh hai)) ((dua tren) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu va pham duc va ((thanh dai) OR (thanh hai)) ((dua tren) or (cua te))*".