Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
toc sach » hoc sach, doc sach, thuoc sach
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (toc sach)) ky nang xa hoi. hieu ve ((cham tuc) OR (tham thuc)) va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (toc sach)) ky nang xa hoi. hieu ve ((cham tuc) OR (tham thuc)) va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (toc sach)) ky nang xa hoi. hieu ve ((cham tuc) OR (tham thuc)) va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (toc sach)) ky nang xa hoi. hieu ve ((cham tuc) OR (tham thuc)) va hanh vi cua te*.