Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thuc gia » thuc giai, thue gia, thuc dia
va trien » va truyen, va thiet, va tuyen
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham

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 ky dang xa hoi. hieu ((ve cham) or (va cham)) thuc gia thanh dat va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu ((ve cham) OR (va cham)) thuc gia thanh dat va trien.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu ((ve cham) or (va cham)) thuc gia thanh dat va trien*.