Perhaps you should try some spelling variations:
nang phat » nang suat, van phat
phat hoc » phap hoc, phau hoc, chat hoc
sach ky » sac ky, sach y, sach ty
cac cau » cac mau, bac cau, cac cam
can cau » van cau, ban cau, can chu
tu sach » thu sach, su sach, te sach
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
va dan » ca dan, va dao, va dau
ca cau » cua cau, ca cac, co cau
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa

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 ky nang phat hoc. hieu ve cam tuc va dan ((ca cau) or (((can cau) OR (cac cau)))) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang phat hoc. hieu ve cam tuc va dan ((ca cau) OR (((can cau) OR (cac cau)))) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang phat hoc. hieu ve cam tuc va dan ((ca cau) or (((can cau) OR (cac cau)))) tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang phat hoc. hieu ve cam tuc va dan ((ca cau) or (((can cau) OR (cac cau)))) tren*.