Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van sinh » van minh, va sinh, van dinh
tu sach » su sach, te sach, tu cach
vat cuu » vat cua
xuc van » duc van, luc van, vuc van
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
va cao » va cac, va dao, va bao
va co » vo co

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 (thu sach)) ky nang xa hoi. hieu ((va cao) OR (va co)) xuc van sinh vat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu ((va cao) OR (va co)) xuc van sinh vat cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang xa hoi. hieu ((va cao) OR (va co)) xuc van sinh vat cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. hieu ((va cao) OR (va co)) xuc van sinh vat cuu tre*.