Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
cau theo » cau thi, cau tao
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
va dinh » van dinh, va kinh, va tinh
dinh vi » dinh ve, dinh viet, dinh tri
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (tu sach)) ky nang x hoi. hieu van cam duc va dinh vi ((cau tren) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (tu sach)) ky nang x hoi. hieu van cam duc va dinh vi ((cau tren) OR (cau theo)).
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (tu sach)) ky nang x hoi. hieu van cam duc va dinh vi ((cau tren) or (cau theo))*.