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, te sach, tu cach
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van bac, dan cac
van cau » van dau, van hau, van chat
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) OR (su sach)) y nang xa hoi. hieu ((van cac) or (van cau)) nuoc va dan thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang xa hoi. hieu ((van cac) OR (van cau)) nuoc va dan thai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y nang xa hoi. hieu ((van cac) or (van cau)) nuoc va dan thai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) y nang xa hoi. hieu ((van cac) or (van cau)) nuoc va dan thai cuu tre*.