Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
du va » dau va, tu va, vu va
su va » su van, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ly nang ma hoa. hieu ve cac ((du va) or (su va)) thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ma hoa. hieu ve cac ((du va) OR (su va)) thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ma hoa. hieu ve cac ((du va) or (su va)) thanh dat cua tre*.