Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
lang mai » lang hai, lang man, sang mai
lang dai » lang hai, lang chai, hoang dai
tu sach » thu sach, su sach, te sach
cau luc » cau truc, cau phuc
cam luc » cam xuc
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
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: tu sach ty ((lang mai) or (lang dai)) hoi. hieu va ((cam luc) or (cau luc)) gia thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((lang mai) OR (lang dai)) hoi. hieu va ((cam luc) OR (cau luc)) gia thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((lang mai) or (lang dai)) hoi. hieu va ((cam luc) or (cau luc)) gia thanh dai cua tre*.