Perhaps you should try some spelling variations:
thanh de » hanh de, thanh ve, thanh do
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
lang ha » long ha
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
de cua » le cua, te cua, dieu cua
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((nang xa) or (lang ha)) hoi. hieu va cam ((xuc va) or (luc va)) thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (lang ha)) hoi. hieu va cam ((xuc va) OR (luc va)) thanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) or (lang ha)) hoi. hieu va cam ((xuc va) or (luc va)) thanh de cua tre*.