Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach kem
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
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 (sach ty)) nang xa hoi. ((hieu va) or (hieu van)) cam xuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sach ty)) nang xa hoi. ((hieu va) OR (hieu van)) cam xuc va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) OR (sach ty)) nang xa hoi. ((hieu va) or (hieu van)) cam xuc va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) OR (sach ty)) nang xa hoi. ((hieu va) or (hieu van)) cam xuc va hanh va cua tre*.