Perhaps you should try some spelling variations:
thanh lay » thanh lap, thanh tay, thanh lam
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nam cuc » nam cac, nam cua, nam thuc
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang x ho. hieu van nam cuc ban thanh lay ((cua tre) or (((cua triet) or (ve triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang x ho. hieu van nam cuc ban thanh lay ((cua tre) OR (((cua triet) OR (ve triet)))).
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang x ho. hieu van nam cuc ban thanh lay ((cua tre) or (((cua triet) or (ve triet))))*.