Perhaps you should try some spelling variations:
nanh thai » nhanh thai, ninh thai, tranh thai
anh thai » anh thi, anh tai, nhanh thai
kham doc » kham cuoc, pham duc, kham da
dang xay » dang van, van xay
tu sach » thu sach, su sach, tu cach
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
te sach » toc sach
doc va » duoc va, hoc va, duc va
cua tu » cua tuc, cua su, cua cu

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 (te sach)) ty dang xay hoi. hieu vu kham doc va ((anh thai) or (nanh thai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty dang xay hoi. hieu vu kham doc va ((anh thai) OR (nanh thai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ty dang xay hoi. hieu vu kham doc va ((anh thai) or (nanh thai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ty dang xay hoi. hieu vu kham doc va ((anh thai) or (nanh thai)) cua tu*.