Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
tham duc » pham duc, tham du, than duc
van hanh » ban hanh, van anh, van ban
te sach » toc sach
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, v nang, may nang

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 ((y nang) OR (ly nang)) xa hoi. hieu va tham duc ((van hanh) or (van thanh)) vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ly nang)) xa hoi. hieu va tham duc ((van hanh) OR (van thanh)) vai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ly nang)) xa hoi. hieu va tham duc ((van hanh) or (van thanh)) vai cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ly nang)) xa hoi. hieu va tham duc ((van hanh) or (van thanh)) vai cua vat*.