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

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