Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
giai duc » giao duc, gia duc, giap duc
tan hanh » tan thanh, tang hanh, toan hanh
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
vai cua » hai cua, lai cua, bai cua
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ly nang ((ma hoi) OR (ma hoa)). hieu va giai duc tan hanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly nang ((ma hoi) OR (ma hoa)). hieu va giai duc tan hanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly nang ((ma hoi) OR (ma hoa)). hieu va giai duc tan hanh ((vai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang ((ma hoi) OR (ma hoa)). hieu va giai duc tan hanh ((vai cua) or (dai cua)) tre*.