Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
pham thuc » phap thuc, pham chuc, pham thu
cua viet » ca viet, hoa viet, cua vat
dang van » hoang van, hang va
ky dang » ky nang, ky danh
van hoe » van hoa, van hoc, van hieu
vu sach » vu bach, vu khach
va hanh » van hanh, va thanh, va danh
su sach » so sach
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) ky dang van hoe. lieu va ((pham thuc) or (nham thuc)) va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky dang van hoe. lieu va ((pham thuc) OR (nham thuc)) va hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky dang van hoe. lieu va ((pham thuc) or (nham thuc)) va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky dang van hoe. lieu va ((pham thuc) or (nham thuc)) va hanh vi cua viet*.