Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
ta thanh » tai thanh, va thanh, ha thanh
xa thanh » va thanh, ha thanh, gia thanh
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
ma hoi » mai hoi, ma hoa, me hoi
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: tu sach ky nang ((ma hoi) or (xa hoi)). hieu va nam thuc ((xa thanh) OR (ta thanh)) hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu va nam thuc ((xa thanh) OR (ta thanh)) hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) or (xa hoi)). hieu va nam thuc ((xa thanh) OR (ta thanh)) hai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (xa hoi)). hieu va nam thuc ((xa thanh) OR (ta thanh)) hai cua te*.