Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thai tuc » thai thuc, thai thuy, thai hoc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hai tuc » hai cuc, thai thuc, hai huoc
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu van ((hai tuc) or (thai tuc)) va xanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van ((hai tuc) OR (thai tuc)) va xanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van ((hai tuc) or (thai tuc)) va xanh di cua tre*.