Perhaps you should try some spelling variations:
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
duc ban » duc tan, duc van, dua ban
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
ve cua » le cua, de cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam ((cua ban) or (duc ban)) hanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam ((cua ban) OR (duc ban)) hanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam ((cua ban) or (duc ban)) hanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam ((cua ban) or (duc ban)) hanh ve cua tre*.