Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
va cam » va cham, va cac, va cao
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: vu sach thu nang x hoi. lieu va cam xuc ((va thanh) or (van hanh)) vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu nang x hoi. lieu va cam xuc ((va thanh) OR (van hanh)) vi va thiet.
• Adding a wildcard symbol may retrieve word variants: vu sach thu nang x hoi. lieu va cam xuc ((va thanh) or (van hanh)) vi va thiet*.