Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
vu kham » vu khanh
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao toc
cao suc » cao su, cao duc
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu kham)) ky nang x ho. hieu va ((cao tuc) OR (cao suc)) xa hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu kham)) ky nang x ho. hieu va ((cao tuc) OR (cao suc)) xa hanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu kham)) ky nang x ho. hieu va ((cao tuc) OR (cao suc)) xa hanh dai cua tre*".