Perhaps you should try some spelling variations:
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua

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

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