Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
qua cam » qua cham, qua cac, qua ca
cam luc » cam xuc, cau luc
va hanh » va thanh, va danh, ban hanh
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi nang x hoi. hieu qua cam luc ((va hanh) OR (van hanh)) ((vi luu) OR (vi lua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thi nang x hoi. hieu qua cam luc ((va hanh) OR (van hanh)) ((vi luu) or (vi lua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su sach thi nang x hoi. hieu qua cam luc ((va hanh) OR (van hanh)) ((vi luu) or (vi lua)) tre*.