Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cua tre » cuu tre, cua triet, dua tren
cuu va » cuu van
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: so sach ty nang xa hoi. hieu van cham ((cuu ve) OR (cuu va)) thanh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu van cham ((cuu ve) OR (cuu va)) thanh dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. hieu van cham ((cuu ve) OR (cuu va)) thanh dai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu van cham ((cuu ve) OR (cuu va)) thanh dai ((cua tre) or (cua te))*.