Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hang dien » quang dien, dang dieu, nhan dien
pham thuc » phap thuc, pham chuc, nham thuc
thuc day » thuc dan, thuc vat
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
hang di » hang doi, hang vi, hang dich
cao hoi » cau hoi, co hoi, tao hoi
y nang » ky nang, ly nang, v nang
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: thuat sach y nang ((cao hoi) OR (cao hoc)). hieu ve pham thuc day ((hang di) or (hang dien)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang ((cao hoi) OR (cao hoc)). hieu ve pham thuc day ((hang di) OR (hang dien)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang ((cao hoi) OR (cao hoc)). hieu ve pham thuc day ((hang di) or (hang dien)) cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ((cao hoi) OR (cao hoc)). hieu ve pham thuc day ((hang di) or (hang dien)) cua te*.