Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
vien cac » vien bach, vien dai, vien da
sach tri » sach tai, sach tren, sach bai
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
xuc va » duc va, tuc va, luc va
ve cac » va cac
va qua » va quan, va quy, va quang

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 tri) OR (sach truc)) nang xa hoi. hieu ((ve cac) or (vien cac)) xuc va hanh va qua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tri) OR (sach truc)) nang xa hoi. hieu ((ve cac) OR (vien cac)) xuc va hanh va qua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tri) OR (sach truc)) nang xa hoi. hieu ((ve cac) or (vien cac)) xuc va hanh va qua su".
• Adding a wildcard symbol may retrieve word variants: te ((sach tri) OR (sach truc)) nang xa hoi. hieu ((ve cac) or (vien cac)) xuc va hanh va qua su*.