Perhaps you should try some spelling variations:
sach ly » sach y, sach lo, sach ty
duc man » duc manh, duc mau, duc van
su sach » so sach, vu sach
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, ma hoa
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: su sach ly nang ma hoi. hieu va cham ((duc man) or (duc tan)) thanh ((vi cua) OR (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoi. hieu va cham ((duc man) OR (duc tan)) thanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ma hoi. hieu va cham ((duc man) or (duc tan)) thanh ((vi cua) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoi. hieu va cham ((duc man) or (duc tan)) thanh ((vi cua) OR (di cua)) tre*.