Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, dat nuoc, cua nuoc
te sach » toc sach
nang xa » nang x, lang xa, nang ma
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang xa hoi. hieu van ((cac nuoc) or (hoc nuoc)) va tinh va cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. hieu van ((cac nuoc) OR (hoc nuoc)) va tinh va cua cu.
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu van ((cac nuoc) or (hoc nuoc)) va tinh va cua cu*.