Perhaps you should try some spelling variations:
thu sac » thu sach, thu xac, thu dac
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
cac lao » ca lao, cac loai, cac giao
hieu va » lieu va, hieu qua
thu san » thuy san, thu ban, phu san
cua tre » cua te, cuu tre, cua triet
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 sac) or (thu san)) ky nang x hoi. hieu va cac lao ((va danh) OR (va dinh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sac) OR (thu san)) ky nang x hoi. hieu va cac lao ((va danh) OR (va dinh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sac) or (thu san)) ky nang x hoi. hieu va cac lao ((va danh) OR (va dinh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sac) or (thu san)) ky nang x hoi. hieu va cac lao ((va danh) OR (va dinh)) vai cua tre*.