Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
cua te » cua tu

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 tru nang ma hoa. hieu va cac ((xuc va) or (tuc xa)) dan vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tru nang ma hoa. hieu va cac ((xuc va) OR (tuc xa)) dan vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach tru nang ma hoa. hieu va cac ((xuc va) or (tuc xa)) dan vi cua te*.