Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu sac » thu sach, thu san, thu xac
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky
va bac » van bac, va cac, va bai
bac vo » bac bo, bac ho, bac va
x hoi » xa hoi, o hoi, x ho
vi su » ve su, ki su, oi su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang x hoi. hieu va bac vo van hanh ((vi su) or (va su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang x hoi. hieu va bac vo van hanh ((vi su) OR (va su)) triet.
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang x hoi. hieu va bac vo van hanh ((vi su) or (va su)) triet*.