Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
sach tri » sach tai, sach tren, sach truc
tri nang » thi nang, tra nang, tri bang
hanh va » hang va, hanh vi
te sach » toc sach
ve cac » va cac
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
va qua » va quan, va quy, va quang
x hoi » xa hoi, o hoi, x ho

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