Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » hieu qua
cau duc » cao duc, cau luc, chu duc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
vi cua » vai cua, di cua

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