Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van ban
tru nang » tra nang, tri nang, truc nano
van anh » van thanh, tuan anh, van minh
van cam » van nam, van lam, van cau
tu sach » thu sach, su sach, te sach
tu nang » tu nong, tu nano, tu lang
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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) OR (van anh)) vi cuu tre~.
• 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) OR (van anh)) vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) or (tru nang)) xa hoi. hieu van cam xuc ((van hanh) OR (van anh)) vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) or (tru nang)) xa hoi. hieu van cam xuc ((van hanh) OR (van anh)) vi cuu tre*.