Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
nang mai » nang ma, nang tai, lang mai
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cuu tre, cua triet
dac va » duc va, day va, dat 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 mai hoi. ((hieu ve) OR (hieu va)) cac dac va thanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang mai hoi. ((hieu ve) OR (hieu va)) cac dac va thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang mai hoi. ((hieu ve) OR (hieu va)) cac dac va thanh dai cua tre*.