Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » thuat sach, thu hoach, khau sach
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
su triet » su viet, su tien, ve triet
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac dac » cac dan, cac dai, cac bac
va hanh » van hanh, va thanh, va danh
dac va » duc va, day va, dat va

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

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