Perhaps you should try some spelling variations:
khoan phau » khoa phau, khoan phai, khoa chau
thuoc sach » hoc sach, nuoc sach, thuat sach
phau thong » phap thong, khau thong, phan thong
hoa khong » khoi khong, hoa cong, he khong
bai hoc » dai hoc
hoc cac » hoc cao
dao tu » dao tuc, dao tru, lao tu
tao tu » tao cu
cac da » cac dan, cac dai, cac dac
da hoa » da khoa, dai hoa, day hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuoc sach ((dao tu) or (tao tu)) cac khoan phau thong ) or ( tu cac bai hoc cac da hoa khong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuoc sach ((dao tu) OR (tao tu)) cac khoan phau thong ) OR ( tu cac bai hoc cac da hoa khong )).
• Adding a wildcard symbol may retrieve word variants: (( thuoc sach ((dao tu) or (tao tu)) cac khoan phau thong ) or ( tu cac bai hoc cac da hoa khong ))*.