Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
thien van » thi van
thuoc ma » hoc ma, duoc ma
nang doc » nang luc
ma hanh » va hanh, da hanh, na hanh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach kem
doc hoi » duoc hoi, hoc hoi, doc hai
sach ty » sach y, sach tu, sach thu
ca tren » cau tren, cu tren, la tren
vi ca » vit ca, li ca, va ca

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) OR (sach ty)) nang doc hoi. ((hieu va) or (thien van)) nha thuoc ma hanh vi ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang doc hoi. ((hieu va) OR (thien van)) nha thuoc ma hanh vi ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang doc hoi. ((hieu va) or (thien van)) nha thuoc ma hanh vi ca tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) nang doc hoi. ((hieu va) or (thien van)) nha thuoc ma hanh vi ca tren*.