Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nuoc van » nuoc va, nuoc san, luoc van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
te sach » toc sach
van anh » van thanh, tuan anh, van minh
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua cau » cua cac, cua chu, cua cay
anh vi » hanh vi, anh va, anh ve
cua cu » cua chu, cua su, cua co

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 ty nang xa hoi. ((hieu ve) OR (hieu van)) cac nuoc van anh vi ((cua cu) or (cua cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. ((hieu ve) OR (hieu van)) cac nuoc van anh vi ((cua cu) OR (cua cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. ((hieu ve) OR (hieu van)) cac nuoc van anh vi ((cua cu) or (cua cau))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. ((hieu ve) OR (hieu van)) cac nuoc van anh vi ((cua cu) or (cua cau))*.