Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va dinh » van dinh, va kinh, va tinh
dinh cu » dinh cuu, dinh chuc, dinh chau
cu cua » cau cua, ca cua, co cua
cua te » cua tu

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) or (hoc sach)) ky nang xa hoi. hieu van pham duc va dinh cu cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky nang xa hoi. hieu van pham duc va dinh cu cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky nang xa hoi. hieu van pham duc va dinh cu cua te*.