Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
va thieu » va thiet, va hieu, va tieu
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu va » lieu va, hieu qua
ha hoi » hoa hoi, ha noi, xa hoi
va han » va phan, van han, va hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang ha hoi. ((hieu van) OR (hieu va)) cham soc ((va han) or (van hanh)) tri va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang ha hoi. ((hieu van) OR (hieu va)) cham soc ((va han) OR (van hanh)) tri va thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ha hoi. ((hieu van) OR (hieu va)) cham soc ((va han) or (van hanh)) tri va thieu".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ha hoi. ((hieu van) OR (hieu va)) cham soc ((va han) or (van hanh)) tri va thieu*.