Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
cham tuc » nham thuc, pham thuc, tham thuc
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang xa hoi. ((hieu van) OR (hieu va)) cham tuc va danh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. ((hieu van) OR (hieu va)) cham tuc va danh di cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. ((hieu van) OR (hieu va)) cham tuc va danh di cua tre*.