Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
xa hanh » xa thanh, xa khanh, va hanh
su tien » su kien, su hien, tu tieng
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai
vi su » va su, ve su, ki su

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 ((ty nang) or (ty xang)) o hoi. hieu ve cac tuc xa hanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) o hoi. hieu ve cac tuc xa hanh vi su tien.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) o hoi. hieu ve cac tuc xa hanh vi su tien*.