Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
cac cuc » cac cuoc, cac cua, cac nuoc
cuc ban » cua ban, cac ban, cuu ban
buu tre » cuu tre
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu sach) OR (su sach))) or (thu hoach)) ky nang cao hoc. hieu ve cac cuc ban thanh tai buu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (thu hoach)) ky nang cao hoc. hieu ve cac cuc ban thanh tai buu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (su sach))) or (thu hoach)) ky nang cao hoc. hieu ve cac cuc ban thanh tai buu tre".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (su sach))) or (thu hoach)) ky nang cao hoc. hieu ve cac cuc ban thanh tai buu tre*.