Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu cao » chieu cao, hieu ca, kieu cao
hieu cac » hieu luc, hieu va, hieu van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
van dai » vanh dai, van dao, van hai
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo

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 ky nang xa hoi. ((hieu cao) OR (hieu cac)) cau truc va van dai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((hieu cao) OR (hieu cac)) cau truc va van dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu cao) OR (hieu cac)) cau truc va van dai cuu tre*.