Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, vu sach
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
tu cach » tu cac
dan vai » dan va, dan tai, dan vat
va dan » ca dan, va dao, va dau
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao
cua tu » cua tuc, cua su, cua cu
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 (tu cach))) or (thu sach)) ky nang o hai. hieu va cam xuc va dan vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (tu cach))) OR (thu sach)) ky nang o hai. hieu va cam xuc va dan vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (tu cach))) or (thu sach)) ky nang o hai. hieu va cam xuc va dan vai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (tu cach))) or (thu sach)) ky nang o hai. hieu va cam xuc va dan vai cua tu*.