Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu sach » thuat sach, thuoc sach, thu hoach
hang loi » thang loi, hang doi, tang loi
day hang » dat hang, dai hang, day nang
thuc day » thuc dan, thuc vat
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
cao hoi » co hoi, cao hoc, tao hoi
tu sach » su sach, te sach, tu cach
loi cua » loai cua, hoi cua, doi cua
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: ((thu sach) or (tu sach)) y nang ((cao hoi) OR (cau hoi)). hieu ve pham thuc day hang loi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y nang ((cao hoi) OR (cau hoi)). hieu ve pham thuc day hang loi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) y nang ((cao hoi) OR (cau hoi)). hieu ve pham thuc day hang loi cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) y nang ((cao hoi) OR (cau hoi)). hieu ve pham thuc day hang loi cua te*.