Perhaps you should try some spelling variations:
dinh tinh » dinh kinh, ninh tinh, dinh thanh
hieu van » hieu va, thien van, lieu va
te sach » toc 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
tinh cu » tinh cua, tinh cau, dinh cu
cu tren » tu tren, dua tren
y nang » ly nang, v nang, may nang
x hoi » xa hoi, o hoi, 5 hoi

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

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