Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thu sach » thuat sach, thuoc sach, thu hoach
cham duc » pham duc, cham soc, pham duy
hanh de » hanh ve, hanh kem
hanh te » hanh tu, hanh ve, hanh he
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
tu nang » tru nang, tu nong, tu nano
va cham » va chat, va tham
x hoi » xa hoi, o hoi, x ho

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)) tu nang x hoi. hieu va cham duc tan ((hanh te) OR (hanh de)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tu nang x hoi. hieu va cham duc tan ((hanh te) OR (hanh de)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) tu nang x hoi. hieu va cham duc tan ((hanh te) OR (hanh de)) su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) tu nang x hoi. hieu va cham duc tan ((hanh te) OR (hanh de)) su triet*.