Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
hanh cac » hang cac, hanh cat, nhanh cay
va giao » van giao, va giai, va gia
hanh ca » hanh cat, hanh cua, hanh cad
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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: ((thu sach) or (thuat sach)) ky lang xa hoi. hieu va giao duc va ((hanh ca) or (hanh cac)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ky lang xa hoi. hieu va giao duc va ((hanh ca) OR (hanh cac)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) ky lang xa hoi. hieu va giao duc va ((hanh ca) or (hanh cac)) cua tre*.