Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh duc » minh duc, ninh duc, tinh duc
cham luc » cham soc, nhan luc, cham cuu
toc sac » toc san, hoc sach, doc sach
duc cuu » duc suu
va dinh » van dinh, va kinh, va tinh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sac) OR (toc sach)) ky ((nang xa) or (nang ma)) hoi. hieu va cham luc va dinh duc cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (toc sach)) ky ((nang xa) OR (nang ma)) hoi. hieu va cham luc va dinh duc cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (toc sach)) ky ((nang xa) or (nang ma)) hoi. hieu va cham luc va dinh duc cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) OR (toc sach)) ky ((nang xa) or (nang ma)) hoi. hieu va cham luc va dinh duc cuu tre*.