Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
cham luc » cham soc, nhan luc, cham cuu
toc sach » hoc sach, doc sach, thuoc sach
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
de cua » le cua, te cua, dieu cua
cua su » qua su

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