Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thien van » thi van
thu sach » tu sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
mua van » ma van, mua ban, mua dan
nam mua » nam cua, nam qua, nam xua
nang ma » tang ma, sang ma, nang cao
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang

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

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