Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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)) ky nang ma hoi. hieu van nam cua ban thanh vai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang ma hoi. hieu van nam cua ban thanh vai su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu van nam cua ban thanh vai su triet*.