Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
ve chao » ve chat, ve cham, ve cho
su sach » so sach, vu sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
hieu ve » hieu va, hieu van
xu van » tu van, vu van, su van
va va » va van, va vai, va vat

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