Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dua tren » dung tren
nang mai » nang ma, nang tai, lang mai
van tuan » van quan, van ban, anh tuan
cau luc » cau truc, cau phuc
cua tre » cuu tre, cua triet, cua thep
luc van » luoc van, luu van, duc van
hieu ke » hieu kem, chieu ke, hieu ky
mai hoi » mai khoi, dai hoi, lai hoi
ke cau » ket cau
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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: toc sach v nang mai hoi. hieu ke cau luc van tuan le ((((cua tre) OR (dua tren))) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang mai hoi. hieu ke cau luc van tuan le ((((cua tre) OR (dua tren))) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang mai hoi. hieu ke cau luc van tuan le ((((cua tre) OR (dua tren))) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang mai hoi. hieu ke cau luc van tuan le ((((cua tre) OR (dua tren))) or (cua te))*.