Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc day
vai cua » dai cua, hai cua, lai cua
ve cam » ve cham, ve cac, va cam
vi 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 ly nang x ho. hieu ve cam ((thuc va) or (thuc dan)) hanh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang x ho. hieu ve cam ((thuc va) OR (thuc dan)) hanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang x ho. hieu ve cam ((thuc va) or (thuc dan)) hanh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang x ho. hieu ve cam ((thuc va) or (thuc dan)) hanh ((vi cua) OR (vai cua)) tre*.