Perhaps you should try some spelling variations:
cham cuu » cap cuu, chat cua
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
hieu va » lieu va, hieu qua
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vai va, vu va
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: te sac ky nang x hoi. hieu va ((cham cuu) or (cham soc)) ((van hanh) or (ban hanh)) vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang x hoi. hieu va ((cham cuu) OR (cham soc)) ((van hanh) OR (ban hanh)) vi va thiet.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x hoi. hieu va ((cham cuu) or (cham soc)) ((van hanh) or (ban hanh)) vi va thiet*.