Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
cham duc » pham duc, cham soc, pham duy
tru nang » tra nang, tri nang, truc nano
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
tu nang » tu nong, tu nano, tu lang
va cham » va chat, va tham

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