Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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 ho. hieu va cam ((xuc va) OR (tuc va)) thanh dat ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x ho. hieu va cam ((xuc va) OR (tuc va)) thanh dat ((cua tre) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x ho. hieu va cam ((xuc va) OR (tuc va)) thanh dat ((cua tre) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x ho. hieu va cam ((xuc va) OR (tuc va)) thanh dat ((cua tre) or (cua tu))*.