Perhaps you should try some spelling variations:
nang tay » nang tai, nang tao, bang tay
hieu van » hieu va, thien van, lieu va
lanh hai » manh hai, thanh hai, lang chai
tu sach » thu sach, su sach, tu cach
te sach » toc sach
tay hoi » tay ho, tao hoi, tay thai
duc ban » duc van, dua ban, duc man
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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 (te sach)) ky nang tay hoi. hieu van dao ((duc ban) or (duc tan)) lanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang tay hoi. hieu van dao ((duc ban) OR (duc tan)) lanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang tay hoi. hieu van dao ((duc ban) or (duc tan)) lanh hai cua tre*.