Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh tai, thanh oai
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
duc ban » duc tan, duc van, dua ban
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
cua te » cua tu

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 xa hoi. hieu van pham duc ban ((thanh vai) or (thanh van)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu van pham duc ban ((thanh vai) OR (thanh van)) ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van pham duc ban ((thanh vai) or (thanh van)) ((cua tre) or (cua te))*.