Perhaps you should try some spelling variations:
khoan nguoi » hoa nguoi, hon nguoi, khoan nhoi
nguoi thong » nguoi muong, nguoi thanh, nguoi cong
sach tham » sach nha
hoach tai » hoach toi, hoach toan, hoach thay
pho thong » he thong
tham tuc » tham thuc, thai tuc, nham thuc
tai thuc » thai thuc, tri thuc, dai thuc
thuc cac » thuc cach, phuc cac, thac cac
cac khoa » cac khoi, dac khoa, cao khoa
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, te sach
tuc cac » tu cac, tich cac

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 tuc cac khoan nguoi thong ) or ( thu hoach tai thuc cac khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham tuc cac khoan nguoi thong ) OR ( thu hoach tai thuc cac khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham tuc cac khoan nguoi thong ) or ( thu hoach tai thuc cac khoa pho thong ))*.