Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
cam loc » cam lo
van cua » vang cua, dan cua, nan cua
ban cua » ban quan
va cam » va cham, va cac, va cao
loc va » hoc va, luc va
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 ty nang ((x ho) or (o hai)). hieu va cam loc va thanh ((van cua) or (ban cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x ho) OR (o hai)). hieu va cam loc va thanh ((van cua) OR (ban cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x ho) or (o hai)). hieu va cam loc va thanh ((van cua) or (ban cua)) triet*.