Perhaps you should try some spelling variations:
vanh tai » van tai, hanh tai, anh tai
van vanh » van anh, van hanh, van manh
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, dua tren
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
cso hai » co hai, cho hai, cao khai
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
so hai » son hai, su hai, so ha
cua te » cua tu

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 ((so hai) or (cso hai)). hieu ve cac xuc van vanh tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((so hai) OR (cso hai)). hieu ve cac xuc van vanh tai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((so hai) or (cso hai)). hieu ve cac xuc van vanh tai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((so hai) or (cso hai)). hieu ve cac xuc van vanh tai ((cua tre) OR (cua te))*.