Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua, dong cua
di cua » dai cua, de cua, do cua

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 ty nang xa hoi. hieu van cac nuoc ((va hanh) or (ban hanh)) ((di cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van cac nuoc ((va hanh) OR (ban hanh)) ((di cua) OR (doi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van cac nuoc ((va hanh) or (ban hanh)) ((di cua) or (doi cua)) tre*.