Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
va trien » va truyen, va thiet, va tuyen
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va nam » van nam, va nay
tuc va » thuc va, truc va, tuc xa
di va » dai va, di vao, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (thuat sach)) ky nang ma hoi. lieu ((va nam) OR (ha nam)) tuc va thanh di va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) ky nang ma hoi. lieu ((va nam) OR (ha nam)) tuc va thanh di va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (thuat sach)) ky nang ma hoi. lieu ((va nam) OR (ha nam)) tuc va thanh di va trien".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) ky nang ma hoi. lieu ((va nam) OR (ha nam)) tuc va thanh di va trien*.