Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thu sach » tu sach, thuat sach, thuoc sach
nang doc » nang luc
dau tren » dau tien, dat tren, dau tieng
doc hoc » duoc hoc, toc hoc, duc hoc
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van dau » van dao, phan dau
xac va » tac va, ac va, bac va
luc va » duc va, tuc va, loc va

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 ty nang doc hoc. hieu ve cham ((xac va) or (luc va)) thanh van dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang doc hoc. hieu ve cham ((xac va) OR (luc va)) thanh van dau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang doc hoc. hieu ve cham ((xac va) or (luc va)) thanh van dau tren*.