Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
tinh cau » trinh cau, sinh cau, tinh ca
tinh cao » tinh lao, tinh chat, tinh cach
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cao suc » cao su, cao duc

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 ((cao suc) or (giao duc)) va thanh ((tinh cau) OR (tinh cao)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van ((cao suc) OR (giao duc)) va thanh ((tinh cau) OR (tinh cao)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu van ((cao suc) or (giao duc)) va thanh ((tinh cau) OR (tinh cao)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van ((cao suc) or (giao duc)) va thanh ((tinh cau) OR (tinh cao)) tre*.