Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
va trien » va truyen, va thiet, va tuyen
thuc gia » thuc giai, thue gia, thuc dia
va chat » van chat, va phat, cao chat
ve cham » va cham, ve chat, vu cham
te sach » toc sach
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
ha hoi » hoa hoi, ha noi, xa hoi

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

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