Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
cham tuc » pham thuc, tham thuc, cham soc
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
ca tren » cau tren, cu tren, la tren
y nang » ky nang, ly nang, v nang
pho ca » pho cap, pho cam, pho can

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. ((hieu ve) OR (hieu van)) ((cham tuc) or (nham thuc)) va thanh pho ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu ve) OR (hieu van)) ((cham tuc) OR (nham thuc)) va thanh pho ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu ve) OR (hieu van)) ((cham tuc) or (nham thuc)) va thanh pho ca tren".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu ve) OR (hieu van)) ((cham tuc) or (nham thuc)) va thanh pho ca tren*.