Perhaps you should try some spelling variations:
thien van » thi van
thi nang » thi cong, ki nang, thi hanh
toc sach » hoc sach, doc sach, thuoc sach
thu nang » thu hang, thu bang, tho nang
tuan de » tuan le, luan de, toan de
qua anh » qua danh, sua anh, qua thanh
nam qua » nam quan, nam cua, nam mua
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

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) or (toc sach)) ((thu nang) OR (thi nang)) xa hoi. thien van nam qua anh tuan de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((thu nang) OR (thi nang)) xa hoi. thien van nam qua anh tuan de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ((thu nang) OR (thi nang)) xa hoi. thien van nam qua anh tuan de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((thu nang) OR (thi nang)) xa hoi. thien van nam qua anh tuan de cua tre*.