Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh tap » thanh lap, thanh tai, thanh tay
day thanh » dao thanh, dat thanh, da thanh
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
hoc cac » hoc cao
hieu he » hieu ve, hiem he, hieu hien
tap cho » tap co, cap cho, tap chi
cho tre » cho thue, khoe tre
hieu le » hieu ve, hieu ly, tieu le
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc cac) or (thuat sach)) ky nang xa hoi. ((hieu le) OR (hieu he)) nam thuc day thanh tap cho tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc cac) OR (thuat sach)) ky nang xa hoi. ((hieu le) OR (hieu he)) nam thuc day thanh tap cho tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc cac) or (thuat sach)) ky nang xa hoi. ((hieu le) OR (hieu he)) nam thuc day thanh tap cho tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc cac) or (thuat sach)) ky nang xa hoi. ((hieu le) OR (hieu he)) nam thuc day thanh tap cho tre*.