Perhaps you should try some spelling variations:
thuat trinh » thuat tinh, thuyet trinh, thuat trong
trinh khong » tinh khong, trinh khung, thinh khong
sach truc » cach thuc, sach tren, sach thu
truc thuc » truc thuoc, thuc thuc, truc thuy
phu thong » pho thong, phap thong, khau thong
tri thuat » trien thuat, ki thuat, tri thuc
khong khi » khong he
khi thong » khi phong, khi tuong, thi thuong
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
khoa phu » khoa phau, khoa thu, hoa phu
sach tri » sach tai, sach tren, sach bai
su sach » so sach
vu sach » vu bach, vu khach

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 anh khoa phu thong ) or ( vu sach tri thuat trinh khong khi thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach truc thuc anh khoa phu thong ) OR ( vu sach tri thuat trinh khong khi thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach truc thuc anh khoa phu thong ) or ( vu sach tri thuat trinh khong khi thong ))*.