Perhaps you should try some spelling variations:
khang khuan » khang chan, khanh thuan, zhang chuan
thuc khang » thuoc khang, thuc khong, thuoc khong
khoa thong » hoa thong, thoai thong, pho thong
truc thuoc » thuc thuc, tri thuoc, tu thuoc
thuoc sinh » hoc sinh, thu sinh, thuoc sach
sach truc » cach thuc, sach tren, sach thu
truc thuc » thuc thuc, truc thuy, trung thuc
doi trong » doi tuong, dot trong, dong trong
su sach » so sach, vu sach
vat doi » vat duoi, va doi, hat doi

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 thuc khang khuan khoa thong ) or ( su sach truc thuoc sinh vat doi trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach truc thuc khang khuan khoa thong ) OR ( su sach truc thuoc sinh vat doi trong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach truc thuc khang khuan khoa thong ) or ( su sach truc thuoc sinh vat doi trong ))*.