Perhaps you should try some spelling variations:
thuat thuc » thuat thuy, thuyet thuc, thuc thuc
va thuat » ky thuat, ki thuat, va thuc
thuc van » thuc vat, thuc dan, thuc va
te sach » toc sach
hieu va » lieu va, hieu qua
van anh » van thanh, tuan anh, van minh
anh dat » thanh dat, lanh dao, dinh dat
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 y ((nang x) or (van xay)) hoi. hieu va thuat thuc van anh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang x) OR (van xay)) hoi. hieu va thuat thuc van anh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang x) or (van xay)) hoi. hieu va thuat thuc van anh dat cua tre*.