Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
thuc day » thuc dan, thuc vat
hanh vai » hanh vi, hanh va, hanh tai
va triet » va thiet, va trien, ve triet
te sach » toc sach
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan
vai va » mai va, dai va, hai va

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 thi nang xa hoi. lieu va cac ((thuc va) OR (thuc day)) hanh vai va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi nang xa hoi. lieu va cac ((thuc va) OR (thuc day)) hanh vai va triet".
• Adding a wildcard symbol may retrieve word variants: te sach thi nang xa hoi. lieu va cac ((thuc va) OR (thuc day)) hanh vai va triet*.