Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh van » thanh san, thanh toan, thanh phan
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, ban thanh, va tinh
van cau » van dau, van hau, van chat
cam loc » cam lo
tu sach » thu sach, su sach, te sach
va cam » va cham, va cac, va cao
ma hoi » mai hoi, ma hoa, me hoi
loc va » hoc va, luc va

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) or (thuoc sach)) ky nang ((ma hoi) or (xa hoi)). lieu va cam loc va thanh van cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky nang ((ma hoi) OR (xa hoi)). lieu va cam loc va thanh van cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky nang ((ma hoi) or (xa hoi)). lieu va cam loc va thanh van cau tren*.