Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
va nang » van nang, da nang, cam nang
v nang » vu nang, van nang, voi nang
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua
cua te » cua tu

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) OR (toc sach)) ((v nang) or (va nang)) xa hoi. hieu va cham luc va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((v nang) OR (va nang)) xa hoi. hieu va cham luc va hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((v nang) or (va nang)) xa hoi. hieu va cham luc va hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((v nang) or (va nang)) xa hoi. hieu va cham luc va hanh di cua te*.