Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
pham chuc » pham duc, pham huu, kham chua
ban tinh » ban thanh, quan tinh, ban hanh
chuc ban » chuc can, chuc van, cuc ban
cua tre » cuu tre, cua triet, dua tren
tinh vi » trinh vi, tinh voi, tinh va
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
te sach » toc sach
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (te sach)) ky dang xa hoi. hieu ve pham chuc ban tinh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (te sach)) ky dang xa hoi. hieu ve pham chuc ban tinh vi ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (te sach)) ky dang xa hoi. hieu ve pham chuc ban tinh vi ((cua tre) OR (cua te))*".