Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang toc » nang doc, nang hoc, nang thuc
cau tren » dau tren, ca tren, cau treo
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
va chat » van chat, va phat, cao chat
toc hoc » toan hoc, duoc hoc
cu tren » tu tren, dua tren

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 ky nang toc hoc. hieu ((va chat) or (vu cham)) duc va hanh va ((cau tren) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang toc hoc. hieu ((va chat) OR (vu cham)) duc va hanh va ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang toc hoc. hieu ((va chat) or (vu cham)) duc va hanh va ((cau tren) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang toc hoc. hieu ((va chat) or (vu cham)) duc va hanh va ((cau tren) OR (cu tren))*.