Perhaps you should try some spelling variations:
lang dai » lang hai, lang mai, lang chai
thu sach » tu sach, thuat sach, thuoc sach
nang dai » nang dau, nang tai, nang cai
tu cach » tu cac
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky ((nang dai) or (lang dai)) hoi. hieu va cac xuc va dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky ((nang dai) OR (lang dai)) hoi. hieu va cac xuc va dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky ((nang dai) or (lang dai)) hoi. hieu va cac xuc va dan vi cua tre*.