Perhaps you should try some spelling variations:
hau truc » hang truc, hoc truc, tu truc
hanh dai » hanh tai, hanh dao, vanh dai
hieu van » hieu va, thien van, lieu va
sach kem » hanh kem
dai cuu » dai cua, dai huu
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky

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 kem) or (sac ky)) nang xa hoi. hieu van ((hau truc) OR (cau truc)) va hanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) nang xa hoi. hieu van ((hau truc) OR (cau truc)) va hanh dai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach kem) or (sac ky)) nang xa hoi. hieu van ((hau truc) OR (cau truc)) va hanh dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sac ky)) nang xa hoi. hieu van ((hau truc) OR (cau truc)) va hanh dai cuu tre*.