Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ty) OR (sach thu)) nang xa hoi. hieu van bac duc va hanh thai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach thu)) nang xa hoi. hieu van bac duc va hanh thai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) OR (sach thu)) nang xa hoi. hieu van bac duc va hanh thai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) OR (sach thu)) nang xa hoi. hieu van bac duc va hanh thai ((cua tre) or (cua triet))*.