Perhaps you should try some spelling variations:
tham sac » pham sach, cham soc, pham san
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
va tham » van tham, va cham, va thanh
sac van » cac van, san van, sat van
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
y nang » ly nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y nang) or (ky nang)) ma hoi. lieu va tham sac van hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) ma hoi. lieu va tham sac van hanh vi ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ky nang)) ma hoi. lieu va tham sac van hanh vi ((cuu tre) or (cua tre))*.