Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ha » sach nha, sach han, sach xa
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
sach v » sach va, sach y, sach 2
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach v) or (sach ha)) nang xa hoi. hieu van cac duc va hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach ha)) nang xa hoi. hieu van cac duc va hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach ha)) nang xa hoi. hieu van cac duc va hanh vi ((cua tre) or (cua te))*.