Perhaps you should try some spelling variations:
lang chai » lang ha, lang cua, lang phi
lanh hai » manh hai, thanh hai, lanh dao
nang xay » dang xay, nganh xay, nang xuan
xay phoi » cay phoi, cap phoi, tay hoi
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
duc ban » duc tan, duc van, dua ban
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
su sach » so sach, vu sach
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 (su sach)) ky nang xay phoi. hieu van cam duc ban ((lanh hai) or (lang chai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xay phoi. hieu van cam duc ban ((lanh hai) OR (lang chai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xay phoi. hieu van cam duc ban ((lanh hai) or (lang chai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang xay phoi. hieu van cam duc ban ((lanh hai) or (lang chai)) cua tre*.