Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ve triet » va trien
su triet » su viet, su tien
cham cuu » cap cuu, chat cua
van den » van de, van der, ban den
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
ve cham » va cham, ve chat, vu cham
cuu va » cuu van, cuu ve

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 (thuoc sach)) ky tang xa hoi. hieu ve cham cuu va van den ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ky tang xa hoi. hieu ve cham cuu va van den ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuoc sach)) ky tang xa hoi. hieu ve cham cuu va van den ((su triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ky tang xa hoi. hieu ve cham cuu va van den ((su triet) OR (ve triet))*.