Perhaps you should try some spelling variations:
nguoi sinh » nguoi binh, nguoi kinh, nguoi ninh
bach khong » bach khang, bach phuong, bach khoa
khong phap » chong phap, khong phai, phuong phap
phap thong » phap phong, phap chong, pho thong
thi nguoi » tho nguoi, thuc nguoi, nghi nguoi
sinh khoa » sinh hoc, sinh hoat, anh khoa
cach thuc » anh thuc, cac thu
sach thi » sach thu, sach tai, sach thieu
tu sach » thu sach, su sach, te sach
khoa he » hoa he, khoa hoc, khong he
tu cach » tu cac
thuc vu » phuc vu, thuc va, thuc ve

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 thi nguoi sinh khoa he thong ) or ( tu cach thuc vu bach khong phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach thi nguoi sinh khoa he thong ) OR ( tu cach thuc vu bach khong phap thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach thi nguoi sinh khoa he thong ) or ( tu cach thuc vu bach khong phap thong ))*.