Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
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
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 y) or (sac ky)) nang xa hoi. ((hieu va) or (hieu van)) cam duc va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach y) OR (sac ky)) nang xa hoi. ((hieu va) OR (hieu van)) cam duc va danh va cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc ((sach y) or (sac ky)) nang xa hoi. ((hieu va) or (hieu van)) cam duc va danh va cua tre*.