Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
cam luc » cam xuc, cau luc
su tren » su tien, tu tren, cu tren
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((y nang) or (v nang)) ma hoi. lieu va cam luc ((van hanh) OR (ban hanh)) vi su tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((y nang) OR (v nang)) ma hoi. lieu va cam luc ((van hanh) OR (ban hanh)) vi su tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((y nang) or (v nang)) ma hoi. lieu va cam luc ((van hanh) OR (ban hanh)) vi su tren".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((y nang) or (v nang)) ma hoi. lieu va cam luc ((van hanh) OR (ban hanh)) vi su tren*.