Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
nang dan » nang danh, nong dan, nang dau
tu sach » su sach, te sach, tu cach
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
cam luc » cam xuc, cau luc
dan hoi » dan hoc, dai hoi, van hoi
xu tren » tu tren, cu tren, xa tren
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang
vi xu » va xu, ve xu, vi su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) y nang dan hoi. lieu va cam luc ((va dinh) or (va tinh)) vi xu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang dan hoi. lieu va cam luc ((va dinh) OR (va tinh)) vi xu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang dan hoi. lieu va cam luc ((va dinh) or (va tinh)) vi xu tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang dan hoi. lieu va cam luc ((va dinh) or (va tinh)) vi xu tren*.