Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
toc sach » hoc sach, doc sach, thuoc sach
hanh cau » nhanh cau, hang cau, hanh cac
cam truc » cau truc, nam truc, lam truoc
tu cach » tu cac
cau cua » cau qua, ca cua, cu cua
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
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: ((tu cach) or (toc sach)) ky nang xa hoi. ((hieu va) or (hieu van)) cam truc va hanh cau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (toc sach)) ky nang xa hoi. ((hieu va) OR (hieu van)) cam truc va hanh cau cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (toc sach)) ky nang xa hoi. ((hieu va) or (hieu van)) cam truc va hanh cau cua tre*.