Perhaps you should try some spelling variations:
thu sac » thu sach, thu san, thu dac
thu xac » thau xay
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
cac bo » bac bo, cac co
va dan » ca dan, va dao, va dap
va dau » va dao
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sac) or (thu xac)) ky nang xa hoi. lieu va cac bo ((va dan) OR (va dau)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sac) OR (thu xac)) ky nang xa hoi. lieu va cac bo ((va dan) OR (va dau)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sac) or (thu xac)) ky nang xa hoi. lieu va cac bo ((va dan) OR (va dau)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sac) or (thu xac)) ky nang xa hoi. lieu va cac bo ((va dan) OR (va dau)) va cua tre*.