Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuat lanh » thuat lap, thuat san
cau tren » cu tren, dau tren, ca tren
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
hanh ve » hanh vi, hanh va, hanh kem
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
ve cau » ke cau, va cau, ve cac
ve cam » ve cham, ve cac, va cam

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) or (thuat lanh)) ky nang ma hoi. hieu ve cam ((xuc va) or (tuc va)) hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat lanh)) ky nang ma hoi. hieu ve cam ((xuc va) OR (tuc va)) hanh ve cau tren.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat lanh)) ky nang ma hoi. hieu ve cam ((xuc va) or (tuc va)) hanh ve cau tren*.