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
ban hang » ngan hang
hang di » hang doi, hang vi, hang dien
qua ban » cua ban, qua quan
nam qua » nam quan, nam cua, nam mua
cua tre » cua te, cuu tre, cua triet
vu nang » vuc nang, va nang, vu dang
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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) or (vu nang)) x hoi. thien van nam qua ban hang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ((y nang) OR (vu nang)) x hoi. thien van nam qua ban hang di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ((y nang) or (vu nang)) x hoi. thien van nam qua ban hang di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) ((y nang) or (vu nang)) x hoi. thien van nam qua ban hang di cua tre*.