Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
hieu van » hieu va, thien van, lieu va
nam thuc » am thuc, nam thu
hanh doi » thanh doi, hanh noi, hang doi
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua, dong cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
nam tu » nam thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ma hoi. hieu van ((((nam thuc) OR (nam thuoc))) or (nam tu)) va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu van ((((nam thuc) OR (nam thuoc))) OR (nam tu)) va hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu van ((((nam thuc) OR (nam thuoc))) or (nam tu)) va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu van ((((nam thuc) OR (nam thuoc))) or (nam tu)) va hanh doi cua tre*.