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

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 cap cuu va van den su 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 cap cuu va van den su triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ky tang xa hoi. hieu ve cap cuu va van den su triet*.