Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
nang mai » nang ma, nang tai, lang mai
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
cac duc » cac du, cao duc, cac nuoc
dat cuu » dat cau, dat cua
cac dac » cac dan, cac dai, cac bac
hieu va » lieu va
sach ly » sach y, sach lo, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
cuu tre » cua tre, cau tren, cau treo

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 va) OR (hieu qua)) ((cac duc) or (cac dac)) va thanh dat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang mai hoi. ((hieu va) OR (hieu qua)) ((cac duc) OR (cac dac)) va thanh dat cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang mai hoi. ((hieu va) OR (hieu qua)) ((cac duc) or (cac dac)) va thanh dat cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang mai hoi. ((hieu va) OR (hieu qua)) ((cac duc) or (cac dac)) va thanh dat cuu tre*.