Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua
hu cua » tu cua, vu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (su sach)) ky nang xa hoi. hieu van pham duc va danh ((hu cua) or (dau cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang xa hoi. hieu van pham duc va danh ((hu cua) OR (dau cua)) te.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang xa hoi. hieu van pham duc va danh ((hu cua) or (dau cua)) te*.