Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
phap thuc » phap thu, phap hoc, phap tu
thu sach » tu sach, thuat sach, thuoc sach
vat dinh » va dinh, van dinh, vat sinh
dinh vai » dinh van, dinh vi, dinh va
te sach » toc sach
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
vai cu » vai cua, van cu

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) OR (te sach)) thieu nang x ho. ((hieu ve) OR (hieu qua)) phap thuc vat dinh vai cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (te sach)) thieu nang x ho. ((hieu ve) OR (hieu qua)) phap thuc vat dinh vai cu tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (te sach)) thieu nang x ho. ((hieu ve) OR (hieu qua)) phap thuc vat dinh vai cu tren*.