Perhaps you should try some spelling variations:
nang doc » nang luc
cham xuc » cam xuc, chat xuc, cham soc
doc hoc » duoc hoc, toc hoc, duc hoc
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va
va cau » van cau, va cac, va cao
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sac ky)) nang doc hoc. hieu ve cham xuc va hanh ((va cau) OR (va dau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang doc hoc. hieu ve cham xuc va hanh ((va cau) OR (va dau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sac ky)) nang doc hoc. hieu ve cham xuc va hanh ((va cau) OR (va dau)) tren".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang doc hoc. hieu ve cham xuc va hanh ((va cau) OR (va dau)) tren*.