Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
cam truc » cau truc, lam truoc, nam truoc
danh tai » doanh tai, dinh tai, hanh tai
doc sach » hoc sach, nuoc sach, dac sac
nam truc » nam truoc, nam thuc, nam trung
va danh » va dinh, va dan, va hanh
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (doc sach)) ky dang xa hoi. hieu qua ((cam truc) or (nam truc)) va danh tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ky dang xa hoi. hieu qua ((cam truc) OR (nam truc)) va danh tai cuc te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ky dang xa hoi. hieu qua ((cam truc) or (nam truc)) va danh tai cuc te*.