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 tuyen, va tieng
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham
ha hoi » hoa hoi, ha noi, xa hoi
thiet » thieu

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 lang ha hoi. hieu ((ve cham) or (va cham)) thuc gia thanh dat ((va trien) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ha hoi. hieu ((ve cham) OR (va cham)) thuc gia thanh dat ((va trien) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang ha hoi. hieu ((ve cham) or (va cham)) thuc gia thanh dat ((va trien) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang ha hoi. hieu ((ve cham) or (va cham)) thuc gia thanh dat ((va trien) OR (va thiet))*.