Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tu sach » thu sach, su sach, te sach
dai cuu » dai cua, dai huu
luc cua » luc chua, luc nua, tuc cua
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
luc ca » luc cao, luc va, luc ha
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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 (thuat sach)) ky nang x hoi. hieu va cau ((luc ca) OR (luc cua)) dat dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang x hoi. hieu va cau ((luc ca) OR (luc cua)) dat dai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky nang x hoi. hieu va cau ((luc ca) OR (luc cua)) dat dai cuu tre*".