Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh tai » thanh tai, hang tai, han tai
cham xuc » cam xuc, chat xuc, cham soc
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
lang dai » lang hai, lang chai, hoang dai
lang mai » lang hai, lang man, sang mai
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
xuc va » duc va, tuc va, luc va

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 ky ((lang mai) or (lang dai)) khoi. hieu van cham xuc va hanh tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang mai) OR (lang dai)) khoi. hieu van cham xuc va hanh tai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang mai) or (lang dai)) khoi. hieu van cham xuc va hanh tai ((cuu tre) or (cau tren))*.