Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
cau duc » cao duc, cau luc, chu duc
hieu va » hieu qua
ly nang » ky nang, ly hang, ly vang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, v nang, may nang
vi cuu » vi luu, vinh cuu

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 ((y nang) or (ly nang)) ma hoi. ((hieu va) or (lieu va)) cau duc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) ma hoi. ((hieu va) OR (lieu va)) cau duc van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ly nang)) ma hoi. ((hieu va) or (lieu va)) cau duc van hanh vi cuu tre*.