Perhaps you should try some spelling variations:
tri nang » tra nang, tri bang, tri mang
thi nang » thi cong, ki nang, thi hanh
te sach » toc sach
va quan » van quan, tac quan, hai quan
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
va qua » 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 nang) or (thi nang)) xa hoi. hieu va cac xuc va hanh ((va qua) OR (va quan)) su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tri nang) OR (thi nang)) xa hoi. hieu va cac xuc va hanh ((va qua) OR (va quan)) su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tri nang) or (thi nang)) xa hoi. hieu va cac xuc va hanh ((va qua) OR (va quan)) su".
• Adding a wildcard symbol may retrieve word variants: te sach ((tri nang) or (thi nang)) xa hoi. hieu va cac xuc va hanh ((va qua) OR (va quan)) su*.