Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
qua cac » cua cac
doi cua » dai cua, hoi cua
luc va » duc va, tuc va, loc va
di cua » dai cua, de cua, do cua
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu qua cac ((luc va) or (thuc dan)) hanh ((di cua) OR (doi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu qua cac ((luc va) OR (thuc dan)) hanh ((di cua) OR (doi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu qua cac ((luc va) or (thuc dan)) hanh ((di cua) OR (doi cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu qua cac ((luc va) or (thuc dan)) hanh ((di cua) OR (doi cua)) te*.