Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tham thuc » nham thuc, pham thuc, tam thuc
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu tham » va tham, vu kham, vu cham
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

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