Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach tri » sach tai, sach tren, sach truc
tri nang » thi nang, tra nang, tri bang
ban hang » ngan hang
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cac cuc » cac cuoc, cac cua, cac nuoc
doi cua » dai cua, hoi cua
do cua » co cua, de cua, dong cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tri nang cao hoi. hieu va cac cuc ((ban hanh) OR (ban hang)) ((do cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tri nang cao hoi. hieu va cac cuc ((ban hanh) OR (ban hang)) ((do cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tri nang cao hoi. hieu va cac cuc ((ban hanh) OR (ban hang)) ((do cua) or (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach tri nang cao hoi. hieu va cac cuc ((ban hanh) OR (ban hang)) ((do cua) or (doi cua)) tre*.