Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
vat cua » bat cua, dat cua, hat cua
mat cua » ma cua, manh cua, mang cua
y nang » ky nang, ly nang, v nang
tac va » tac da, tac xa, tuc va
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 y nang x hoi. hieu va cac tac va van ((vat cua) OR (mat cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu va cac tac va van ((vat cua) OR (mat cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu va cac tac va van ((vat cua) OR (mat cua)) tre*.