Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
tu sach » thu sach, su sach, te sach
loai ca » loai cay, loai cua, loai va
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
ca tre » ca tren, cua tre, ca tru

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((thu nang) OR (thu hang)) xa hoi. hieu ve pham thuc ((va dan) or (ca dan)) loai ca tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu nang) OR (thu hang)) xa hoi. hieu ve pham thuc ((va dan) OR (ca dan)) loai ca tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thu nang) OR (thu hang)) xa hoi. hieu ve pham thuc ((va dan) or (ca dan)) loai ca tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thu nang) OR (thu hang)) xa hoi. hieu ve pham thuc ((va dan) or (ca dan)) loai ca tre*.