Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dau phuc » cau phuc, dieu phuc, dau khu
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
du hanh » dieu hanh, duy khanh, luu hanh
phuc du » phuc vu, phuc su, thuc du
van dau » van dao, phan dau
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat sach)) ly ((nang xa) or (nang ma)) hoi. hieu van dau phuc du hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ly ((nang xa) OR (nang ma)) hoi. hieu van dau phuc du hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ly ((nang xa) or (nang ma)) hoi. hieu van dau phuc du hanh vi cua tre*.