Perhaps you should try some spelling variations:
dan thai » dang thai, dan thi, dan than
thai cuu » thai cua, tai cuc, thi cuc
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
van dau » van dao, phan dau
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau

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 cac) or (van dau)) nuoc va dan thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ((van cac) OR (van dau)) nuoc va dan thai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ((van cac) or (van dau)) nuoc va dan thai cuu tre*.