Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
thi hang » thi hanh, thi nang, thi hong
hanh vai » hanh vi, hanh va, hanh tai
su triet » su viet, su tien, ve triet
tu sach » su sach, te sach, tu cach
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
va cao » va cac, va co, va dao
tuc va » thuc va, truc va, tuc xa
vai su » va su, van su, lai su

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) or (thu sach)) thi hang xa hoi. hieu va cao tuc va hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) thi hang xa hoi. hieu va cao tuc va hanh vai su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) thi hang xa hoi. hieu va cao tuc va hanh vai su triet*.