Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuat lanh » thuat lap, thuat san
dau tren » dau tien, dat tren, dau tieng
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
hanh ve » hanh vi, hanh va, hanh kem
ve cam » ve cham, ve cac, va cam
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
ve dau » va dau, ve du, ke dau

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