Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cua suc » cua duc, cua tuc, cua cuc
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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: toc sach v nang mai hoi. ((hieu ve) OR (hieu van)) cac xuc van hanh vi ((cua suc) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang mai hoi. ((hieu ve) OR (hieu van)) cac xuc van hanh vi ((cua suc) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang mai hoi. ((hieu ve) OR (hieu van)) cac xuc van hanh vi ((cua suc) or (cua su))".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang mai hoi. ((hieu ve) OR (hieu van)) cac xuc van hanh vi ((cua suc) or (cua su))*.