Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
van hau » van ha, van hai, van dau
hau loc » huu loc, phau hoc
loc van » luoc van, hoc van, lo van
hanh de » hanh ve
cuu tre » cua tre, cau tren, cau treo
cu tren » tu tren, dua tren
y nang » ky nang, ly nang, v nang

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