Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
benh mai » benh dai, benh tai, benh bai
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
benh ma » benh man, benh va, benh da
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
tu sach » su sach, te sach, tu cach
cua su » qua su
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) ky nang x hoi. hieu van cam duc ban ((benh ma) or (benh mai)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang x hoi. hieu van cam duc ban ((benh ma) OR (benh mai)) cua su*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang x hoi. hieu van cam duc ban ((benh ma) or (benh mai)) cua su*".