Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thu sach » tu sach, thuat sach, thuoc sach
tu cach » tu cac
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (((thu sach) or (hoc sach)))) ky dang xa hoi. lieu va cac duc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (((thu sach) OR (hoc sach)))) ky dang xa hoi. lieu va cac duc va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (((thu sach) or (hoc sach)))) ky dang xa hoi. lieu va cac duc va hanh vi cuu tre*.