Perhaps you should try some spelling variations:
khoan kham » khoa kham, khoanh khac, khoan cam
kham thong » khap thong, khau thong, pham thuong
sach truc » cach thuc, sach tren, sach thu
truc thac » truc thuoc, thuc thuc, thuc thai
khoa phan » hoa phan, khoa than, khoa phau
phan hong » phan cong, pham hong, phan song
xay khoan » may khoan, cac khoan, may khoa
thac dau » thau dau, tac dau, thuat dau
dau khoa » da khoa, dac khoa, dai khoa
sach nam » sach nay, sach tham, sach nang
nam thau » nam thu, nam thai, nam thanh
thau xay » thuat xay, tu xay, phan xay
su sach » so sach, vu sach
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach truc thac dau khoa phan hong ) or ( te sach nam thau xay khoan kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach truc thac dau khoa phan hong ) OR ( te sach nam thau xay khoan kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach truc thac dau khoa phan hong ) or ( te sach nam thau xay khoan kham thong ))*.