Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va triet » va thiet, va trien, ve triet
thuc tap » tuc tap, thuc thai, thuc dan
dang tai » dang thai, dung tai, hang tai
su sach » so sach
tai hoi » tai khoi, dai hoi, tai hai
ky dang » ky nang, ky danh
vu sach » vu bach, vu khach
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
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: ((su sach) OR (vu sach)) ky dang tai hoi. hieu ve cam ((thuc tap) or (thuc vat)) thanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky dang tai hoi. hieu ve cam ((thuc tap) OR (thuc vat)) thanh dai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky dang tai hoi. hieu ve cam ((thuc tap) or (thuc vat)) thanh dai va triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky dang tai hoi. hieu ve cam ((thuc tap) or (thuc vat)) thanh dai va triet*.