Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thanh de » hanh de, thanh ve, thanh do
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
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
cuu tre » cua tre, cau tren, cau treo
tu tren » tu truyen, tu tieng, tu trong

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 ly nang xa hoi. hieu van hau loc van thanh de ((cuu tre) or (tu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly nang xa hoi. hieu van hau loc van thanh de ((cuu tre) OR (tu tren)).
• Adding a wildcard symbol may retrieve word variants: toc sach ly nang xa hoi. hieu van hau loc van thanh de ((cuu tre) or (tu tren))*.