Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
cau tren » cu tren, dau tren, ca tren
tu cach » tu cac
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) y nang xa hoi. hieu van cham duc va hanh di ((cau tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) y nang xa hoi. hieu van cham duc va hanh di ((cau tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) y nang xa hoi. hieu van cham duc va hanh di ((cau tren) or (cua triet))*.