Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tru nang » tra nang, tri nang, truc nano
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
xuc van » duc van, luc van, vuc van
tu nang » tu nong, tu nano, tu lang
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach

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 ((tu nang) or (tru nang)) xa hoi. hieu van cam xuc van hanh vi ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tru nang)) xa hoi. hieu van cam xuc van hanh vi ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) or (tru nang)) xa hoi. hieu van cam xuc van hanh vi ((cuu tre) or (cau tren))*.