Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat xuc » chat huu, cam xuc, chao xu
van hanh » van thanh, ban hanh, van ban
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
van anh » van thanh, tuan anh, van minh
thiet » thieu

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 ty ((nang x) or (lang xa)) hoi. hieu van chat xuc ((van hanh) OR (van anh)) nam va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang x) OR (lang xa)) hoi. hieu van chat xuc ((van hanh) OR (van anh)) nam va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang x) or (lang xa)) hoi. hieu van chat xuc ((van hanh) OR (van anh)) nam va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang x) or (lang xa)) hoi. hieu van chat xuc ((van hanh) OR (van anh)) nam va thiet*.