Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
nang cai » nang cao, nang tai, nang cap
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
cai hoi » cau hoi, dai hoi, cai hoa
hieu va » lieu va, hieu qua
cac duc » cao duc, cac dac, cac nuoc
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet

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 cai hoi. hieu va ((cac duc) or (cac du)) va thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang cai hoi. hieu va ((cac duc) OR (cac du)) va thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ly nang cai hoi. hieu va ((cac duc) or (cac du)) va thanh dat cua tre*.