Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thanh day » thanh tay, thanh dam, thanh dan
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
cac duc » cao duc, cac dac, cac nuoc
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang

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