Perhaps you should try some spelling variations:
sach tham » sach nha
tham nang » nham nang, tham lang, tham nhung
cau theo » cau thi, cau tao
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
xac va » tac va, ac va, bac va
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: tu sach tham nang x hoi. hieu van cam ((xac va) or (duc va)) ((hanh vai) or (hanh tai)) cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tham nang x hoi. hieu van cam ((xac va) OR (duc va)) ((hanh vai) OR (hanh tai)) cau theo.
• Adding a wildcard symbol may retrieve word variants: tu sach tham nang x hoi. hieu van cam ((xac va) or (duc va)) ((hanh vai) or (hanh tai)) cau theo*.