Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va duong » van duong, va tuong, va huong
van cac » van hac, van cau, van bac
van hoc » van hoa
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
doi va » hoi va, noi va
dai va » mai 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 ky lang xa hoi. hieu ((van cac) or (van hoc)) truc va duong ((doi va) OR (dai va)) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky lang xa hoi. hieu ((van cac) OR (van hoc)) truc va duong ((doi va) OR (dai va)) trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky lang xa hoi. hieu ((van cac) or (van hoc)) truc va duong ((doi va) OR (dai va)) trien".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky lang xa hoi. hieu ((van cac) or (van hoc)) truc va duong ((doi va) OR (dai va)) trien*.