Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
nang doc » nang luc
doc hoc » duoc hoc, toc hoc, duc hoc
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ly nang » ky nang, ly hang, ly vang
sach ly » sach y, sach lo, sach ty
hanh va » hang va, hanh vi
luc va » loc va
tuc va » thuc va, truc va, tuc xa
va cau » van cau, va cac, va dau

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