Perhaps you should try some spelling variations:
hoach trien » hoach chien
kham thong » khap thong, khau thong, pham thuong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
khoa kham » kho khan, khoa than
trien tuc » trien thuc, trien thuoc, thien tu
khoan hoi » khoan nhoi, khoa hoi, khoa hoc
hoi thong » hoi thuong, hoi trong, hoa thong
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
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 tren thuc anh khoa kham thong ) or ( thu hoach trien tuc cac khoan hoi thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren thuc anh khoa kham thong ) OR ( thu hoach trien tuc cac khoan hoi thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren thuc anh khoa kham thong ) or ( thu hoach trien tuc cac khoan hoi thong ))*.