Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
ban hanh » ban hang
nang mai » nang ma, nang tai, lang mai
cua tuc » cua duc, cua thuoc, luat tuc
xuc ban » duc ban, cuc ban, quoc ban
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ve cac » va cac, vien cac
v nang » va nang, vu nang, van nang
cua tu » cua su, cua cu, cua te

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) OR (hoc sach)) v nang mai hoi. hieu ve cac xuc ban hanh vi ((cua tuc) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) v nang mai hoi. hieu ve cac xuc ban hanh vi ((cua tuc) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) v nang mai hoi. hieu ve cac xuc ban hanh vi ((cua tuc) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) v nang mai hoi. hieu ve cac xuc ban hanh vi ((cua tuc) or (cua tu))*.