Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thoi thuoc » phoi thuoc, choi thuc, hoc thuoc
kham thong » khap thong, khau thong, pham thuong
hoach toi » hoach hoi, hoach toan, hoach do
khoan phu » khoa phu, khoan phai, khoa thu
phu thong » pho thong, phap thong, khau thong
cach thoi » cac thoi, cach thuc, cach noi
sach khoa » bach khoa, sach nha, anh khoa
khoa kham » kho khan, khoa than
toi tich » doi tich, toi tinh, noi thich
tich cac » tich va, tich bao
tu cach » tu cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach toi tich cac khoan phu thong ) or ( tu cach thoi thuoc sach khoa kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach toi tich cac khoan phu thong ) OR ( tu cach thoi thuoc sach khoa kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach toi tich cac khoan phu thong ) or ( tu cach thoi thuoc sach khoa kham thong ))*.